# Volume Definition

Volume is referred to as a three-dimensional space that is occupied by a matter for any other closed figure.

SI unit of volume is cubic meter (cm3) but many other units exist which include cubic centimeter, pint, quart, gallon, tablespoon, etc.

Examples of volume are; These beer bottle bottles hold 250 ml of alcohol.

Ishita drank 100 ml of water.

You can purchase a gallon of milk.

## Volume of Liquid

The volume of a liquid can be measured with the help of a measuring container such as a measuring cup, graduated cylinders.

The volume of liquids is addictive but this is not always true because the volume of miscible liquids such as that of alcohol and water may be less than the sum of the separate volumes.

Another point to be noted is that dissolvable solids in two liquids don’t always result in their adjective volumes.

### Volume of Gas

Volume of a gas is defined as the volume of its container as the gas expands to fill the space available to them in the given container.

The volume of a gas is sometimes determined by the displacement of its liquid.

#### Volume of Solid

The volume of a solid can be calculated by using its dimensions.

For example; the volume of a rectangular solid is the product of its length, width, and height that is V=lwh.

##### Volume vs Mass

The volume and mass are considered the same but these are two different properties of matter.

Volume is defined as the amount of space occupied by a substance on the other hand mass is the amount of matter contained in a substance.

Density is defined as mass per unit volume but it is possible to have volume without the mass the example for the same would be an enclosed vacuum.

###### Volume vs Capacity

Capacity and the volume of a container are not the same as capacity is defined as the capability of an object to contain a substance that is either solid, liquid, or gas, whereas volume is referred to the three-dimensional space that is occupied by the matter.

Volume is measured in cubic units such as in cubic centimeters and cubic meters etc.

Capacity is measured in metric units such as in liters, gallons, etc.

###### Charles Law

Charles law states that the volume of a certain amount of gas is directly proportional to that of temperature in kelvin when the pressure remains constant.

This can be written as;

**V = kT **

k = proportionality constant

V = volume of given gas

T = temperature of a given gas

###### Boyles Law

Boyle’s law states that the volume of a certain amount of gas is inversely proportional to its pressure when the temperature is kept constant.

The equation can be represented in the form of;

**P = k/V **

k = a proportionality constant

P = Pressure of given gas

V= volume of a given gas

###### Avogadro's Law

Avogadro’s law states that the volume is directly proportional to the number of moles of a given gas when the pressure and the temperature both remain constant.

The following equation can be written in the form of

**V = kn **

k = proportionality constant

n = Number. of moles of a given gas

V= volume of a given gas

###### Ideal Gas Law

The above four laws discussed are combined to produce an ideal gas law which is a relationship between pressure, volume, temperature, and the number of moles present in given gas.

The equation is given as

**PV = nrt **

P = pressure of the gas

V= volume of gas

N = number of moles of gas

T = temperature in kelvin

r = Constant and is also known as the ideal gas constant for the universal gas constant.

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