Gas laws
Thermal Physics > Kinetic Theory
Balloon ride
If the weight of the air displaced by the balloon is greater than the weight of the balloon and the gas inside, the balloon will float upwards. Thus, the weight of the person gets balanced with the pressure of the gas inside the balloon.
- Charles law: At constant volume, the pressure of a gas is directly proportional to its absolute temperature.
- Gay Lussac's law: At constant pressure, the volume of a gas is directly proportional to its absolute temperature.
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Boyle's law: At a constant temperature the volume of a given mass of gas is inversely proportional to its pressure.
- Ideal gas Equation: The three gas laws describe the interdependence of two of the three variables namely pressure, volume and temperature, when one of them is held constant. We can combine them to give a relation among all the three variables. This relation among the three variables P, V and T for an ideal gas is called ideal gas equation. The ideal gas equation is derived for the volume of one mole of gas in order to get the constant in the general gas equation same for all gases.