FarleyPhysics.com

Today you and a partner will create a presentation on Temperature.  Don’t worry, you don’t have to present it.

1. Find Keynote (look on the Dock, or in Hard Drive > Applications Folder > iWork) and start it.

Double-click to add text and use the Masters button to change the look of the slide

2. For each temperature example on the Absolute Temperature chart below, create a presentation slide with the temperature in Celsius, the temperature in Kelvin, an image, and a description of what the image is.  You should have 14 slides plus a title slide.

3. When you are done, be sure to save it and name it with your name and your partner’s name in the name.

Run the simulation here.

1. Click the checkbox for Light Species as the gas in the pump, and click the Measurement Tools button and the checkbox for species information.

2. Pump gas into the container until the pressure is 1 ATM.  This is one atmosphere, the pressure you feel at sea level.  You can open the door on top to release some pressure also.  Draw a picture of this in your notes.

3. What is the average speed of particles and the temperature of your gas?

4. Add or remove heat until there are 2 ATM’s of pressure.  What is the average speed and temperature now?

5. Grab the guy on the left and move him to the left, making the gas container larger.  What happens to temperature and pressure?  Write this as a statement: “When the size of the container gets larger…”

6. Now move the guy to the right, making the container smaller.  Describe what happens.

7. Press the reset button and fill up the container with 1 ATM of pressure again. What happens to the temperature and pressure when you remove heat?  What happens to the Average speed of molecules?  Write this as a statement: “When you remove heat from a gas…”

8. Add heat to the gas and explain what happens to the speed of the particles.

9. Does it look like the distance between particles ever changes as temperature or pressure changes?

10. What happens to temperature and pressure when you open the container?  Write this as a statement.

11. Reset the simulation and put 1 ATM of gas into the container.  Click the Constant Volume Parameter at the top right and explain what happens to temperature and pressure when you heat the gas.

12. Bring the gas back down to 1 ATM and click Temperature as the Constant Parameter.  Move the guy back and forth.  What has to happen in order to keep the gas at a constant temperature when the volume gets smaller (look at the heater).

13. Click Pressure as the constant parameter.  If you add heat, what happens to the volume of the container?  When you remove heat, what happens to the volume?  Write this as a statement: “To keep a gas at constant pressure, the volume must___________ when you add heat and _______________when you remove heat.

Start here with this simulation of molecules in 2-D container.

1. Watch the red dot.  It represents a gas molecule.  Describe its motion.

2. Does the red molecule always travel at the same speed?  Describe what the speed does.

3. Draw a picture in your notes showing the simulation.

Next, increase the temperature by clicking the up arrow a bunch of times.

4. Describe the motion of the red molecule compared to before.

5. Does it go the same speed all the time now?

Next, decrease the temperature by clicking the down arrow a bunch of times.

6. Describe the motion of the red molecule now.

7. Can you make all the molecules stop completely?

8. When all movement stops completely, that is called absolute zero temperature.  Do you think absolute zero is possible?

Temperature Equilibrium

When atoms are moving, the average kinetic energy of the atoms is called Temperature.  The following applet shows how temperature is transfered from one gas to another.

Click here, Run each of the experiments.  Draw a picture of the applet and answer the questions for each experiment.  Answer in the form of a statement that includes the question.