Freeze Water by Boiling

[tonkapoplol]

where you can buy a vaccum like this

[iceowls]

Hi, thank you for the video.

I am interested in purchasing a vacuum pump to make ice from liquid water.

Where can I purchase them? How strong are they?

thank you!

[cris23dumi]

boiling its putting elements in creating collisions freezing is taking them out and they don't look similar

[Zoomer1er]

Mr.Patterson Rocks ! :D ...NOT !

[bumblebee1024]

i wont drink a coffee like that

[NukeBluff]

they make it sound too easy to understand

[cr41gwoody]

I recon that cos the water is changing state it uses a lot of energy in this case HEAT using up the energy making it freeze

[G8tr1522]

its a bong!! XD

[NamesROverated]

@G8tr1522 i don't think you've ever seen a bong before..

[G8tr1522]

its a bong!! XD

[saik0pod]

how come can vaccum foods arent frozen???

[freakin1random]

holy shit, its called entropy. calm down people, it means the same thing. conserv. of energy. gas has more kinetic energy than liquid, but that energy comes from the liquid in this case (vapor pressure), thus cooling it. he just said it in a simple way that people can understand.

[Hypercube619]

You gotta love science. :D

[rudmop]

@Diogenes2077 From the standpoint of thermodynamics the system is sealed from the environment by the bell jar. Molecules in the system are not all moving with the same kinetic energy; although the measurement of the average kinetic energy of all them together is the temperature. When a surface molecule is moving in a direction that it can escape the cup but still lacks the energy, it will be able to escape if another molecule with more kinetic energy has an elastic collision with it.

[PingPongPay]

@rudmop The idea that there are "very cold and very hot" molecules in the water is incorrect. Due to heat transfer, each water molecule will have approximately the same kinetic energy. Once the pressure in the chamber is equal to vapor pressure of the water, the water will start to boil. Energy is required for the water to transition from liquid to vapor (this is known as the latent heat of vaporization). As the water boils, it's removing energy from the surrounding water, causing it to cool.

[PingPongPay]

@PingPongPay Also, another reason the water is freezing is due to the Joule-Thomson effect... As the vapor is being sucked out of the chamber, the remaining air will cool down. This effect is similar to why a can of compressed air feels cold after cleaning your PC or keyboard. I think most of the cooling would be due to the latent heat and not the Joule-Thomson effect though.

[Diogenes2077]

Ähm, I may be wrong, but your explanation about "the hot part of the water boiling away and leaving only cold water behind" sounds a bit silly.

As far as I know, the point would rather be, that heating up any substance takes a constant amount, but changing from liquid to gaseous state takes an imensely higher amount of energy. The engergy needed to evaporate from the liquid state is taken from the environment, mostly from the still liquid part of the water, wich is thus cooled down.

[Ivansky1]

Is it Coffee or why is it Black???

[s2556]

@Ivansky1 thats the colour of the inside of the cup

[Ivansky1]

@s2556 Seriously or your just assuming that???

Why would they pick such a bad cop for a presentation???

[s2556]

@Ivansky1

im assuming that but am confident in it. they say its water in the video so its the only explenation i can think of.

[philritter21]

Tempichure

[Spastb00n]

Its much more like this: water uses up energy when changing its' state, this is because energy is needed to force the molecules apart against attracting forces, that held them together in the liquid phase.

This energy is taken from the heat energy of the remaining water, so it cools down.

Water has a so called vapor pressure at any given temperature, and if this pressure, that the water tries to evaporate with, exceeds the pressure of the atmosphere, it starts to boil.

[pochul]

it's impposible to know the temp of vaccum space , bcuz vaccum can't transfer is energy to thermoter , u will eventually know the temp of light who warm the thermometer plastic by radiance ( not have atom ) also we don't know the temp of boiling of water in vaccum space ,when vaccum space are created energy from

because the empty don't have temp it don't have atom too , it's just a bad ask ilogical, the emtpy don't have energy it' also don't have temp we can't know it

[pochul]

everyone know that without air the energy can't transfer to another atom by touching ,but only by wave( the wave can cross the empty but the heat can't )then when the water with his energy( 25 degrre )energy can't transfer to another atom near him , it don't have choise to release his energy to infrared wave it's cause the boiling ,when energy is gone it's become ice . don't try to calculate temp of incide empty vacuum bcuz it's impossible u will know the temp of thermometer only,empty=no energy

[MinEgenKanal]

What! There ARE fast freezing devices! Why can't we buy

vacuum freezers when we can buy microwaves!?

[halomasterchief14]

why do people boil water this way if it doesn't get hot, or warm. Say I'm up on a mountain would I want to boil my water with heat to make coffee? Boiling like this isn't going to make the water warmer or is it the friction of the atoms rubbing together that causes heat? Could I make hot chocolate using this method and not waste fossil fuels?

[saladisyuck02]

@halomasterchief14 are you retarded???? the water boils because the air pressure in the bell jar being taken away, causing the oxygen molecules in the water to leave, and the water to evaporate.

[halomasterchief14]

@saladisyuck02 i guess i am, but why would people use this technique to boil water istead of heating it up

[saladisyuck02]

@halomasterchief14 nobody uses this technique to boil water instead of heating it up. its just used as a demonstration for science teachers to show what pressure does to an everyday thing like water.

oh and i'm only 13.

[albusvir]

@halomasterchief14

I think what is being confused here is the fact that boiling is in fact a cooling process. Heat (energy) is applied at pressure (atmosphere) and in order to try to cool itself or to reach an equilibrium with the surrounding air temp it has to release energy. (boiling) Now relate this to the vacuum. It goes in at room temp. and as the gasses are allowed to escape do to the lack of pressure, the liquid cools.

[halomasterchief14]

@albusvir oh I see, the boiling by pressure reduction, is kind of like a pop bottle, when it's closed you dont see bubbles but when you open it it boils, is it like that scenerio? When pop is opened you hear a hiss noise and bubble start to come up? Also, if you deep sea dive, with the decompression steps to avoid bubbles from clogging the arteries on the way up

[pochul]

@halomasterchief14 it's impossible bcuz im almost sure if we open the bell and touch the watter after boiling it's will not warmer but cooler because we don't add any energy ( we take it out ) , the boiling is due at his own energy ( the warm ) it consumer also energy , in infrared wave , but if we check with infrared thermoter we will see many degree but these degree are like fake ,remenber that in vaccum space , energy can't transfer by heat ,bcuz no atom around for take it !but only by wave

[rudmop]

I don't know exactly the purpose of your comment. Heat travels from hot to cold and never in reverse. Also heat can travel by electromagnetic waves (infrared) or by conduction (by atoms with greater kinetic energy, colliding with adjacent atoms of lesser kinetic energy) and by convection of fluids like gas or liquids that flow with the hotter less dense fluid rising in the colder more dense fluid.

[rudmop]

I suppose the vacuum pump runs on 750watts/hr and I ran it for 1/3 of an hour; so that would be about 250 watts. Find the heat of fusion of water and measure the mass of the ice formed, and calculate the energy the water molecules at 0 degrees Celcius would have had to released to freeze; but don't forget the mass of water that evaporated off and you will need to calculate the amound of heat given off by the total sample of water when that mass evaporated. also 1 g H2O loses 4.18 j

[KoalaLumpUhr]

Units! It is 750 W * 1/3 h = 250Wh = 900 000Ws = 900 000 Joule ;)

[DEMONTEM]

Yeeey Jelly

[TimpBizkit]

Is this anything to do with the latent heat required in turning water into a gas, or is that only energy that you would need to counteract atmospheric pressure under normal conditions?

[Heksu77]

Interesting, I knew that water will boil in vacuum, but I've never thought it any deeper.

[robbynoble91]

Why is the water colored? It looks like coffee =P

[kempsdaman]

they;ve painted the inside black so heat can transfer thru it faster. If it was still white more heat would be stay in the cup.

[goateater45]

Woot! it's Mr Patterson!

[jman4622]

who gives a shit about ur arguements? its a cool video

[missyrawien]

By saying that there is a difference in the molecules temperature to such a degree that they're left behind in solid form isn't he really saying his sample isn't pure water...?

If what he's showing is true, his physics is bollocs. I think this is a bit of a trick tbh...

[rudmop]

You need to know how hydrogen bonding in water and how temperature and pressure of water causes water to change its state. The solid molecules are not left behind, the cold ones are; they also are close enough together and moving slowly enough to set up strong intermolecular attractions via hydrogen bonding and establish a crystalline network.

[mattkunq]

@missyrawien

temperature is kinda like a average measurement of kinetic energy of the molecules. So it isnt trickery. There are molecules of water that have different amount of energy than the rest.

[McGuywer]

lol

[BigBananaMan]

When liquid nitrogen freezes to a solid it will look just like snow and it rises out of the cup like a magic snake firework. This really is ice because it's clear. Go do a little research, any little amount, before you go shouting "fake"

[hopeso]

How do you come to the conclusion that some of the molecules were hot and some were cold?

Why would not all of the molecules be at the same temperature?

Or, does this demonstration illustrate the fact of the matter.

But then why, how, would molecules in a liquid medium have such a large variance in temperature?

[rudmop]

The molecules in any sample of any substance are not all moving the same speed and therefore do not have the same kinetic energy which in turn means they do not all have the same temperature. Temperature is the average kinetic energy of all the molecules of a substance.

[wearestupid101]

this guy has a boring voice.

i mean, he is intellegent, but he puts me to sleep.

[vmelkon]

There is a similar technique for cooling metals. I think it is called the Josephson-junction. By passing electricity, the hottest electrons are removed, the cold electrons can't jump, so as a result, one side of the metal cools down.

[hjgardner79]

I'm pretty sure what you are talking about is the Peltier effect. A Josephson junction is two superconductors separated by a thin insulating barrier. A supercurrent at zero voltage flows across the junction due to a difference in the phase of the wavefunction on either side of the barrier.

[crapbag140]

i have heard that in the highest points on earth, people can drink boiling water and not get burned

[benjya999]

Correct - but it's because at high altitudes (ie low air pressure), water boils at a lower temperature. At the top of Mt Everest, water boils at about 69C, much cooler than the 100C at sea level.

[TopSpeciesX]

In simpler terms ( from what I gathered) The fast/hot atoms leave, and the cold ones stay behind.

:D

[SOPHIEPEREZ]

cool

[conradglowa]

I think i found a new way to drink Coca cola...

[rudmop]

John from 7th grade, ask your science teacher, who helped you with your understanding of thermodynamics, to explain to you the difference between heat and temperature. I tried to do so in a reply to you below. With only 500 characters to tyep, its very difficult to explain, but clearly you have some misconceptions you might wish to fix. ;)

[rudmop]

Temperature is a reading of the average kinetic energy of molecules of a substance. KE=1/2mv^2. Since the water molecules have nearly the same mass, then some do have a greater velocity, and some have a lesser velocity. The water molecules cannot escape each other's hydrogen bond attractions in the presence of air pressure. When air pressure is removed, the faster ones, going in the right direction can out pull their attractions to hydrogen bonding and evaporate, the slower, colder ones can't.

[john19681]

I do know the difference between heat and temperature. I would know... I got that question wrong on the test :)

I don't know what your talking about though... too complicated. Hydrogen bonding ?.?

[rudmop]

Boiling is not only a temperature dependent process, it is defined as the process in which the vapor pressure of a liquid equals the pressure above the liquid. The vapor pressure of a liquid depends on its temperature. For Water, its intermolecular attractions caused by hydrogen bonding, make it have an unusually low vapor pressure for a substance with such a low molar mass. But like most liquids, it will easily boil when you remove the pressure above it as in this demo.

[john19681]

Wow that was a great explanation! I get it now. I never knew what boiling actually meant until now (I never gave it much thought either)

[sakebomb1989]

Ok what basically happens is that when he puts the water in a vaccum the water begins to boil in order to fill the empty space.(fluid dynamics at uni).Now the only way the water is going to fill the void is if it is turned into gas. Energy from the main body of liquid water is used to vaporize some of the liquid water and turn it into gas. Seeing as energy is being taken from the liquid water its core tempterature will decrease and may eventually freeze depending on the area needed to fill.

[neatstatus]

So when no pressure is exerted on water molecules, they boil?

I thought pressure raises temperature? If someone can, pleasea explain this.

[grib695]

yes cuz it is in a vacum

[scoof67]

we boild water like this in class its prety cool

[0676262]

PV = NRT

P=pression

V=volume

N = nombre de mole

R = constante des gaz

t= Temperature

htey reduce de pressure with the vaccum so the temperature has to lower too to keep the equality since R,N,V doesn't change

[BastianLeba]

In fact N does change! ;)

[Termite551]

SO the hot molecules that were in the water were free to escape, and a decrease in hot molecules will reduce the average temperature. Then the average to cold molecules in the cup binded together to form ice? cool

Im only 7th grade but I think it makes sense now

[egreen86]

kool

[swimmadude66]

Wow first short comment

[adameld]

lmfao

[speier]

welcome to the world of science. it's a nice change from "noob, go home. this is fake"

[rudmop]

Its important that temperature is a reading of the average kinetic energy of molecules of a substance. The water molecules cannot escape each other's hydrogen bond attractions in the presence of air pressure. When air pressure is removed, the faster ones, going in the right direction can out pull their attractions to hydrogen bonding and evaporate, the colder ones can't.

[usenetposts]

Are youall saying that when the man in the film says that some of the molecules are hot and others are cold in the 19.2 degree water, and the vacuum only really separates the men from the boys that this is not true? I also am not convinced by it. I think the boiling is with no molecules being at 100 degrees, only due to lack of pressure on the miniscus, and that the effect of evaporation pulls energy away from the rest of the water, just as the wind makes wet skin feel cold.

[Worls14]

Temperature and pressure are directly related. Water is normally boiled by applying heat, which increases the pressure under the surface of the water (molecules moving faster and bumping into each other more) to match the pressure on the surface, which causes bubbles to rise. The same thing happens when you decrease the pressure on the surface of the water. The temperature change is just a by-product of the pressure change.  Good demo.

[pappanino]

Ok, "hot" just refers to fast moving molecules. Normally when the fast moving molecules in the liquid try to escape, the many molecules in the room push them back down into the liquid. But if you remove the outside air the fast or "hot" moving molecules can escape or "boil" with little resistance. The molecules left behind are on average slower moving or "cold" and so the average temperature is cold. BTW heat and calories are not interchangable terms

[soylentgre]

The mean free path of a water molecule in water is miniscule. Things bump into each other and redistribute that energy very quickly. The distribution of energies stays the same basic shape and slides to colder temperatures as molecules that happen to get enough energy through collision escape.

[Neon8787]

Best one of these I've seen so far.

[pokerrundog]

Good demonstration! I'm no physicist but I don't think that the phenomenon shown in your demonstration can accurately described in terms of hot and cold molecules. I believe what is happening is that the waters rapid change in state from liquid to gas forces the calories (heat) to be taken out of the adjacent molecules until the water freezes.

[gitnerd]

ahh but u forget do you? the procces of boiling can happen at anytempatuer making it the act of "cooling" whitch makes your theory not exact because just because it became a gas dosent mean that heat escaped, even though heat rises, it would need to be tested somehow, i well

[coRn3]

I have to agree with pokerrundog! Energy is needed for a liquid to change phase. You force the liquid to change phase by lowering the pressure, which then absorbs the energy from the surrounding liquid, lowering the temperature - same principles as used in any type of phase change cooling; eg refrigeration. If I am wrong about this, will someone please explain?

[coRn3]

Oh, and obviously the water remains liquid, turning into ice only when you raise the pressure back up to atmospferic pressure....

[mach1haven]

When the air pressure is lowered in the jar, the pressure in the water is lowered as well... the water vapors can then form at a much much lower temperature (room temp) then normal (100*c) this causes boiling to accure. The water that leave the cup takes along with it energy, leaving the water left in the cup to be colder. If this goes on long enough you have frozen water due to boiling. and no, it was ice when it was inside the belljar aswell, not just when he took it out.

[K0koK00koo]

holy god i dont know what any of you are saying..awesome video though

[pokerrundog]

Actually this is cool because the boiling point of water becomes lower as the atmospheric pressure drops. This is why you must adjust cooking times a higher elivations. As the atmospheric pressure drops the water is first boiling at room temperature, and then as calories are taken out of the adjacent molecules it then freezes at room temperature.

[woundedhamster]

Yeeah, Steam, way to go!