Based on your explanation for the pickle problem, what would you expect to happen to the pressure of a confined gas when the temperature is increased? Discuss this with your lab partner.

Using the lab setup on the computer, determine how changing the temperature of a gas affects the pressure of the gas, while keeping the gas at a constant volume.

1. Select the size (volume) of the gas container.

2. Choose a temperature by clicking on the top of the mercury column in the thermometer, and move the column up or down.

3. Record your data when you are satisfied with your choice of temperature.

4. You should collect data for at least eight to ten different temperatures and pressures. Copy your data from the screen into your notebook before proceeding to a new volume.

5. After completing at least two different experiments (at two or three different volumes) go to the analysis/application activities.

   Keep in mind that even though you have changed the volume of the container, the number of gas particles has not changed.

   Think about the pickle jar problem! What happens as the hot pickle jar cools?

1. Describe the relationship between temperature and pressure. You might start your sentence like this: As we increased the temperature of our gas, the pressure...

   

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   In science and mathematics, we describe the relationship between two variables (like pressure and volume) as either "direct" or "inverse."
   • In a direct relationship, if one variable increases in value, the other variable also increases. (Lift more weights, build more muscles.)
   • In an inverse relationship, if one variable increases, the other variable decreases. (Skip more school, grades go down)

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2. Is the relationship "direct" or "inverse?"
   Give some examples from your data table to support your answer.

3. What do you think happens to cold air in winter as it enters your warm lungs ?