 Let's talk about some of the different units you could use to measure volume. The SI standard unit for volume would be the meter cube, meter cube, which is a cube with a length of one meter, a height of one meter, and the width of one meter. Then you can also see the derived units of a decimeter cube and a centimeter cube. Let's think for a moment how many decimeters cubes are there in one cubic meter. If we follow the unit conversion procedure that I gave in another video, I will do the following. Meter cube is the same as a meter times a meter times a meter. So if I want to convert, I need to get rid of three times the meter, one meter, one meter. So a decimeter, deci meaning one tenth, that's like this in French, ten, meaning I have ten decimeters in one meter. Ten times one tenth gives me the meter. So if I multiply this, the meter here gets rid of the meter here, that meter gets rid of that meter here, and that meter gets rid of that meter here. So ten times ten times ten gives me one thousand decimeter cube. So I have one cubic meter is a thousand decimeter cube. Let's do the same for the centimeter cube. So I have one meter times meter times meter is, I want one meter to get rid of it, another meter to get rid of it, and another one to get rid of it. And as centimeters, the C stands for hundred song. So I have a hundredth of a meter is a centimeter, so a hundred centimeter is one meter times hundred centimeters a meter times hundred centimeter is a meter, and what I get is hundred times hundred times hundred. You can type this in a calculator, it should give you a million or if you do it with a scientific notation, one, two, three, four, five, six. So one times ten to the sixth centimeter cube. So I can rewrite here, my one cubic meter is thousand decimeter cube equals to one times ten to the sixth centimeter cube. There are other units that are frequently used, one of them is the liter. What is a liter? A liter is the amount of liquid that I can put into this glass up to this line. It actually says right here, one liter. So this is about one liter, believe it or not, but the liter is actually a metric unit. It is defined as one decimeter cube. So I could set this one equal, that means in one cubic meter there are how many liters? A thousand. So thousand liters is a cubic meter. Another unit that's now derived from the liter that's very frequently is the middle liter, the middle liter, which is equal to one centimeter cube. Would you be able to do the math to show me that these two are actually equal? Give it a try. Now if you don't have anything around that allows you to measure any of these units, you might have to fall back to some more traditional units. One of them is the cup, one cup. The problem with the cup is that it depends a bit on what definition of the cup we use. It could be smaller or bigger. But usually one cup is either 0.20 or 0.25 liters, so it could either be two deciliters or two and a half deciliters. Sometimes you're lucky and it says on your cup how much it is and then you could use this as a perfect measuring device. If you look here, I see a number written that tells me how many liters this is. This one here is 0.25 liters, so it's on the bigger end of the spectrum. You might could also use a bottle of some soda that he bought. Usually they're also telling you exactly the volume that's in there. There are many more units, but I think these are the most common ones that you will encounter and these are some that you can maybe use if you're in the kitchen and you try to measure something.