19 January, 2011

Activity 2 1-19-11 Weather and Bernoulli's principle

Describe some common weather occurrences in relation to the gas laws and characteristics we have been exploring.

This explains why there is always a strong wind off of a lake. I mostly just assumed it came off lakes because it was a large open area where wind could really get going or something, but now I see that it's because the lake is a much different temperature. There is an expansion of the molecules because of the heat of the sun and the temperature changes and differences.
As the water comes from the pacific over the west mountain ranges it drops lots of water as it starts to go up the mountain because it gets cooler as you go up. Then as you get over the mountain there is desert on the opposite side for the same, but opposite reason. With this you get chinook winds coming down the mountain. All the air comes down the mountain, and as it gets warmer it expands, and as it expands it needs more room so it goes faster.

What is the Bernouli Principle, provide an example or application of this.

If you decrease the pressure, you will increase the speed. And if you increase the pressure you will decrease the speed.

With the wing of an airplane you have air going over and under the wing. The air on the top goes over the wing much faster than the air on the bottom, but the slow moving air under the wing also pushes up on the wing. The air on the top has a lower pressure, which is why it goes over faster, and there is more pressure on the air under the wing, so it goes slower.That is Bernoulli's principle, that more density makes air move slower and less density allows air to move faster.

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