Molecules move very fast and bounce off of surfaces. The bouncing by air pressure causes pressure. The pressure increases if molecules are introduced to a higher temperature, or more molecules are bouncing off one another. The formula for this is PV=nRT. P-pressure V-volume n-number of molecules R-ideal gas constant T- temperature. In this activity, there are constants for each situation. When the hole is open, temperature and pressure are constant. When the hole is closed, temperature and number of molecules change.
- Using the glove in container, have students stick their hand in the glove and pull it out with the hole open.
- note the feeling
- Have students stick their hand in the glove and pull it out with the hole closed
- Note the feeling
Purpose: Being able to have students feel the pressure and compare it to the volume.
Introduce: Talk about the relationship between pressure and volume and why they are constants in one part of the activity. Talk about n and T and why those are constants as well. Students need to be able to define these terms.
Difficulties: understanding why the glove won’t come out at all when the hole is covered.
Changes: More videos to help learning.