Physics	Thermo Internet Lab	Name:

Date: ______________ Per:

Log on to: phet.colorado.edu/new/simulations/

Choose Heat & Thermo on the left-hand side.

Click on Gas Properties, found under the diagram to the right.

Click Run Now, found under the diagram.

Part One:

1.	Pump the handle once. After a few moments, record temperature and pressure:

___________ Temperature, ___________ Pressure

2.	Using the little person pushing on the wall, decrease the volume of the box. What happens to the:

Temperature:

Pressure:

3.	Use the Heat Control and remove heat until it is back to the original temperature in #1. Now increase the volume of the box, and describe what happens to the pressure:

Explain why this occurs:

4.	Pump the handle one more time, and describe what happens to the pressure:

Explain why this occurs:

Part Two:

5.	Click the Volume button in the Constant Parameter box. Hit the green Reset button. Pump the handle once. After a few moments record: ___________ Temperature ___________ Pressure

6.	Add heat and record what happens to the temperature and pressure:

7.	Remove heat until the is around 10 K. Describe what happen to the pressure and explain why:

8.	What happens to the particles as the temperature decreases?

9.	Play with the heat control until you get the pressure around 0.5 atm.

Part Three:

10.	Click the Pressure button in the Constant Parameter box. Hit the green Reset button. Pump the handle once. After a few moments record: ___________ Temperature ____________ Pressure

11.	Remove heat until it’s around 200 K. What happens to the Volume? Explain why this happens:

12.	Add heat until it’s around 400 K. What happens to the Volume? Explain why this happens:

13.	If you keep adding heat so the pressure goes above the initial pressure, why doesn’t the pressure remain constant? (It’s set on constant pressure.)

14.	Remove the heat until the temperature is around 500 K.

Part Four:

15.	Click the Temperature button in the Constant Parameter box. Hit the green Reset button. Pump the handle once. After a few moments record: ___________ Temperature ____________ Pressure

16.	Click on the person pushing on the wall and make the container smaller. Observe what happens at the heater when this is done. Explain why this happens:

17.	Keep pumping the handle until the pressure exceeds the gauge limit. Describe what happens to the temperature and pressure afterwards:

Why does the heater come on?

18.	Hit the green Reset button. Pump in some Heavy Species. Click the red Light Species, and pump one more time. How does the speed of the larger particles compare to the speed of the lighter particles?

They are both at the same temperature. Explain why they are moving the way they do in terms of kinetic energy:

19.	Research Heat Engines. Find out about Reciprocating Heat Engines, and write a short paragraph on how they work:

Physical Science

dickson.s

2008-02-05

Modesto City Schools