Charles’ Law states that at a constant pressure, the volume of a fixed mass or quantity of gas varies directly with the absolute temperature.

$$V = c\times T$$

In the formula, V is volume, T is absolute temperature measured in Kelvin, and c is a constant.

- Launch the simulator. Click HERE.
- Reset the pressure to zero using the red valve under the pressure gage
- Reset the temperature by pressing the “Cool” until the temperature reads 10 K then press “OFF” when done.
- Select Gas A or Gas B. The gas of choice will be in CAPS.
- Push the piston three times to increase the pressure
- Increase the temperature by clicking “Heat” at about 500K then click “Heat” again to stop the heating.
- Record in the Table 1 below, the Pressure, Temperature and Volume
- Press “Cool” to decrease the temperature and record four more temperature and corresponding volume in the Table 1 below.

Press “Cool” to stop the cooling and get a fixed temperature reading.

- Stop recording data when you get five data points in the table.

**Table 1: Experimental Data**

Pressure - FIXED [atm] | Temperature [K] | Volume [l] |
---|---|---|

- Calculate and record the volume in m3.
- Draw the graph of temperature (on y-axis) versus volume (on x-axis)
- Determine whether the slope of the plot of temperature versus volume is linear.

**Question**

How well does your graph of temperature versus volume support the idea that volume of a gas at constant pressure is directly proportional to the absolute temperature of the gas?

- Introduction

Boyle’s Law states that the product of the volume of a gas times its pressure is a constant at a fixed temperature.

$$P\times V = k$$

where k is a constant.

Therefore, at a fixed temperature, the pressure will be inversely proportional to the volume. As pressure increases, volume decreases. The relationship shown below shows that a plot of pressure versus the reciprocal of the volume will be linear.

$$P=\frac{k}{V}$$

where k is a constant.

- Launch the simulator. Click HERE.
- Reset the pressure to zero using the red valve under the pressure gage
- Reset the temperature by pressing the “Cool” until the temperature reads 10 K then press “OFF” when done.
- Select Gas A or Gas B. The gas of choice will be in CAPS.
- Increase the temperature by clicking “Heat” at about 400K then click “Heat” again to stop the heating.
- Push the piston three times to increase the pressure
- Record in the Table 2 below, the Temperature, Volume and Pressure
- Press the down arrow to decrease the volume and record four more volume and corresponding pressure in the Table 2 below.

Press the down arrow to stop the decrease in volume and get a fixed volume reading.

- Stop recording data when you get five data points in the Table 2 .