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 what exactly is Boyles Law and what does it define?

Boyle's law gives the relation between pressure (p) and volume (V) of a fixed amount of gas. Boyle's law states that at constant temperature, the pressure of a fixed amount (number of moles, n) of a gas is inversely proportional to its volume.

Mathematically, it is represented as 

, where = Proportionality constant

From the above equation, it is found that at constant temperature, the product of pressure and volume of a fixed amount of a gas is constant. Also, if at constant temperature,

V1 = Volume of a gas at pressure p1

V2 = Volume of the same gas at pressure p2

Then,

p1V1 = p2V2 = Constant

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The principle that, for relatively low pressures, the pressure of an ideal gas kept at constant temperature varies inversely with the volume of the gas. To be more precise, for a body of ideal gas at constant temperature, the volume is inversely proportional to the pressure. You can also think of it this way: as the volume increases, the pressure decreases. As the volume decreases, the pressure increases. 

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The principle that, for relatively low pressures, the pressure of an ideal gas kept at constant temperature varies inversely with the volume of the gas. To be more precise, for a body of ideal gas at constant temperature, the volume is inversely proportional to the pressure. You can also think of it this way: as the volume increases, the pressure decreases. As the volume decreases, the pressure increases. 

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