1. Temperature: As temperature increases, gas molecules move faster and collide more frequently with the walls of their container. This leads to increased pressure and volume.

2. Pressure: Pressure is the force exerted by gas molecules on the walls of their container. Increasing pressure forces the gas molecules closer together, decreasing volume.

3. Volume: The volume of a gas is the space it occupies. Changing the volume of a container affects the pressure and density of the gas. Increasing the volume gives the molecules more space to move, decreasing pressure.

These three factors are interconnected and are described by the ideal gas law, which states:

* PV = nRT

Where:

* P is pressure

* V is volume

* n is the number of moles of gas

* R is the ideal gas constant

* T is temperature