Volume
Take a closer look at a pop can, a galloon of milk, or a carton of orange juice.  How do you think that the manufacturers try to make sure that there is a gallon in a galloon of milk, 8 ounces in a pop can, and 2 liters in the carton of orange juice?

Well, if you guessed that the measure it out to specific volume, you are right!

Volume is the amount of space occupied by an object.
Volume can also be defined as the amount of how much something spreads out in three dimensions.  That is why we usually measure cubes in cubic centimeters.

Since volume refers to the space matter occupies, it is usually measured in liters. The volume of 1 mole of any gas at STP (standard pressure and
temperature) is 22.4 liters. The volume of 1 mole of solid carbon dioxide is 28 cm3, which is not much bigger than a large ice cub. However, the same
number of carbon dioxide molecules, as a gas, occupies 25000 cm3, a volume almost 1000 times greater. Only a small fraction of the total volume of the
gas is occupied by the molecules themselves. The rest of the volume is empty space. Thus, there is a lot of room for the molecules to move closer
together - by compression. When a gas is compressed, the same number of particles can now occupy a different volume and if that volume is decreased the pressure increases and vice versa. This is so because of when the volume decreases so does the inside surface area so the molecules can now exert more pressure on a concentrated area.
 

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