# Number # 7 – Ideal Gas

Define: pressure

1. Make a prediction as to what will happen to a certain gas in these conditions (increase or decrease):
1. For a constant temperature gas:
How does an increase/decrease in pressure change the volume?
How does an increase/decrease in volume change pressure?
2. For a constant pressure gas:
How does an increase/decrease in volume change the temperature?
How does an increase/decrease in temperature change the volume?
3. For a constant volume gas:
How does an increase/decrease in temperature change the pressure?
How does an increase/decrease in pressure change the temperature?
2. Simulate the above-described situations, conducting all the experiments with only one type of gas, light or heavy. Make note of the results below. Note: pressure and temperature will fluctuate―use the middle value, or the average of the outermost values. To fill out the table, the elemens of the table (what you fill in) should describe the change in the variable that’s not represented by the row and column headers. For example, for column 1, row 2, record your results for what happened when you increased the temperature (header in column 1) for a constant pressure gas (label for row 2.)
 Change in: (inc. | dec.) T=temperature P=pressure V=volume ↑ ↓ ↑ ↓ ↑ ↓ Constant T V? V? P? P? Constant P V? V? T? T? Constant V P? P? T? T?

What happens to the actual molecules when the temperature is increased in constant-volume situation? How might this change affect the pressure?

1. What is the relationship between volume and temperature (direct―as one increases, the other increases, or inverse―as one increases the other decreases)? Temperature and pressure? Volume and pressure?