@Gertywow The holes/pores are caused by volcanic gases, but they themselves are not volcanic gases. The texture is called porous.
I don't know where you got the 40 pounds from because I don't say that in the video or the description- I'd estimate this chunk is between 5 & 10 pounds.
Just a correction to one of his comments - the pumice does not get "filled" with gases, it already IS filled with gases when it is ejected from the volcano. As it rises, the decrease in pressure allows the gases (like H2O and CO2) that are dissolved in the magma to rapidly exsolve and expand. At the same time, the rapid cooling freezes the bubbles in place.
@fpgt91 Thanks for the information. I know that there are gases in the lava and that the pressure release would cause them to expand (although ironically the temperature decrease causes them to shrink some), but I had been told that more gases dissolved in the lava as it flew through the air (I've never verified this or looked it up on my own).
Have said that some stores will mislabel pumice and scoria and some will just call it "volcanic rock" so you might end up purchasing pumice under a different name.
Pumice is grey in color and scoria is rust in color [actually the color comes from rusted iron].
I don't see why not. The biggest problems would be balance [related to the shape of the rock], finding a large enough piece [or holding enough together without affecting density], and its inability to have support large loads [multiple people].
yes, i think that you will be an amazing teacher for me. im in year 8 and we are studying this. but i thought that the pumice couldn't do damage to you much? my teacher said that even a really big pumice part can be easily picked up by anyone? im confused help me out.
Nice video:) In my native language pumice is called plovec, what could be translated as floater or floating rock.. When I was younger I used to fish with a float made from an orange-red (like mediterranean soil) colord stone I got from an old fisherman. I can`t remember what it was. Have you got any ideas? I guess it was just a colored piece of fumice.
Probably colored pumice although it may have been scoria which is just like pumice except it comes from lavas that are more felsic (that is, they have a higher iron content). Usually the iron makes them slightly more dense than water, but I suppose it would be possible (if there were enough air holes) for it to be less dense, or maybe if you were fishing in salt water (which is more dense) that could also cause it to float.
Cool video, randomness got me here though
all the way from England
G00g284 8 months ago
Hole, is actually called volcanolic gases trapped to make gas bubbles, and it doesnt weight 40 pounds, either.
Gertywow 9 months ago
@Gertywow The holes/pores are caused by volcanic gases, but they themselves are not volcanic gases. The texture is called porous.
I don't know where you got the 40 pounds from because I don't say that in the video or the description- I'd estimate this chunk is between 5 & 10 pounds.
mrericsully 9 months ago
Just a correction to one of his comments - the pumice does not get "filled" with gases, it already IS filled with gases when it is ejected from the volcano. As it rises, the decrease in pressure allows the gases (like H2O and CO2) that are dissolved in the magma to rapidly exsolve and expand. At the same time, the rapid cooling freezes the bubbles in place.
fpgt91 1 year ago
@fpgt91 Thanks for the information. I know that there are gases in the lava and that the pressure release would cause them to expand (although ironically the temperature decrease causes them to shrink some), but I had been told that more gases dissolved in the lava as it flew through the air (I've never verified this or looked it up on my own).
mrericsully 1 year ago
That's pretty cool, Is pumice the only rock that floats in water?
raulbcd554433 2 years ago
As far as I know.
Have said that some stores will mislabel pumice and scoria and some will just call it "volcanic rock" so you might end up purchasing pumice under a different name.
Pumice is grey in color and scoria is rust in color [actually the color comes from rusted iron].
mrericsully 2 years ago
So, can a large enough piece hold a person's weight? Like if a floating bridge was built from it, could you walk on it?
ukulelemike 2 years ago
I don't see why not. The biggest problems would be balance [related to the shape of the rock], finding a large enough piece [or holding enough together without affecting density], and its inability to have support large loads [multiple people].
mrericsully 2 years ago
yes, i think that you will be an amazing teacher for me. im in year 8 and we are studying this. but i thought that the pumice couldn't do damage to you much? my teacher said that even a really big pumice part can be easily picked up by anyone? im confused help me out.
nithun4 2 years ago
Man i wish you was my teacher
trueskiller 2 years ago
Thanks that really humbles me and makes my day.
mrericsully 2 years ago
Nice video:) In my native language pumice is called plovec, what could be translated as floater or floating rock.. When I was younger I used to fish with a float made from an orange-red (like mediterranean soil) colord stone I got from an old fisherman. I can`t remember what it was. Have you got any ideas? I guess it was just a colored piece of fumice.
biohazardSLO 2 years ago
Probably colored pumice although it may have been scoria which is just like pumice except it comes from lavas that are more felsic (that is, they have a higher iron content). Usually the iron makes them slightly more dense than water, but I suppose it would be possible (if there were enough air holes) for it to be less dense, or maybe if you were fishing in salt water (which is more dense) that could also cause it to float.
mrericsully 2 years ago