Here is a classy song about air pressure. I'll also include the essay questions that we will have on our Pressure Standard Check.
Feel free to answer these questions on the blog. If you'd rather wait until tomorrow (Thursday) during class, you may do that as well.
- It is late summer and you play a game of basketball at the park. After the game, you store the ball in the garage where it stays until a cold day in February. On this day, you attempt to bounce the ball only to discover that it "thuds" instead. The ball is flat. What happened? Explain why the ball does not bounce in terms of pressure.
- Every breath you take is a miraculous exercise in pressure. Your diaphragm muscle contracts and pushes downward, allowing room for your rib cage and lungs to expand. The expansion allows air (containing oxygen) to rush into your lungs. What happens to the pressure inside your lungs when they expand? Why does this cause air to move there? When your diaphragm and intercostal muscles relax, the space in your chest cavity decreases. What happens to the air pressure in your lungs (compared to the air outside) when they shrink in size? Why would this cause air to leave?
3 comments:
1.) As the temperature gets cooler, the pressure goes down. There is more energy in the warm air molecules than there is in cold air molecules. Hot air takes up more space. With the cold air, the molecules took up less space.
2.) When your lungs expand, the warm air molecules are expanding. The more they expand, the more air that can be put inside them. Cold air doesn't expand, so when you breathe out, your lungs shrink, forcing the air out.
1. The ball stayed inflated in the summer because of hot temperatures. When the ball stays in the garage in February, the cold air meets the warm ball and it deflates(kind of like the can lab)
1. It's almost the same with the crushed can, but slower. Inside the basketball in low pressure because it had warmer air in it. Then when it got colder outside the higher pressure flattened the ball.
2. The pressure becomes high because then there is more room for air to rush in. It causes air to move because the pressure is making the air move through the lungs. When the lungs shrink they have lower pressure and it could cause air to leave because there isn't as much pressure on the air now.
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