**What factors must you consider to study gas behavior?**

The factors we must consider to study gas behavior are:

**Pressure (P):** the force exerted by gas molecules as they strike a given surface.

**Volume (V):** the space occupied by gas molecules.

**Temperature (T):** A measure of how fast gas molecules move (kinetic energy).

**Amount (n):** Amount in moles of gas molecules.

If any two of the four factors are related, a change in one produces a change in the other. To study the

relationship between any two factors, we must hold the other two factors constant.

### To study the effect of:

- temperature on the volume of gas, we have to hold the pressure and amount constant.

- pressure on volume of a gas, we have to hold the temperature and amount constant.

- temperature on the pressure of gas, we have to hold volume and amount of gas constant.

- amount of gas on volume of gas, we have to hold pressure and temperature constant.

To read about the relationship between

- temperature and volume of gas, click here.
- pressure and volume of gas, click here.
- pressure and temperature of gas, click here.
- amount and pressure of gas, click here.