can some1 please explain the gas laws please in physics?

Question

or tell me a website where i can get help

Answer 1

For gas laws, see:

http://en.wikipedia.org/wiki/Gas_laws


Actually the only gas law that counts nowadays is the ideal gas law:

PV = nRT

where P = pressure, V = volume, n = number of moles of gas, T = temperature, and R is the ideal gas law constant.


In the olden days this was broken down into several gas laws:

Boyle's law relates pressure and volume
Charles's law relates volume and temperature
Gay-Lussac's law relates pressure and temperature

With Avogadro's work, they could be combined into one equation.

If you hold two variables constant in in the ideal gas law, you can see how change of another variable affects the remaining variable.

If you hold temperature and moles constant, increasing pressure decreases the volume of a gas. If you hold pressure and number of moles constant, an increase in temperature causes an increase in volume.

If you hold volume and moles of gas constant, an increase in temperature causes an increase in pressure.

Answer 2

Boyle's Law: if you squeeze a gas, it gets smaller.
volume is inversely proportional to pressure
pressure up means volume down
Example: your lungs (and the airspace behind your eardrum) get smaller when you dive down under water.

Charles Law: If you heat a gas, it expands
volume is directly proportional to temperature
temperature up means volume up
Example: hot air balloons, hot air rises

Gay-Lussac's Law: For a given amount of gas, if you squeeze it, it gets hot
temperature is directly proportional to pressure
pressure up means temperature up
Example: in a fridge, the coolant gas is compressed, and gets hotter than room temperature. It is allowed to cool to room temperature. Pressure is reduced, so now the gas is cooler than before.

Answer 3

That is a broad question, but you may want to search for the Laws of Pascal, Bournullei (sp?), and the "general gas law". And I believe Hooke's Law may be another you'll want to look up. Just use google, tons of info out there.

Answer 4

You may find this website is a good start:
http://www.chemistry.ohio-state.edu/betha/nealGasLaw/

Another good choice is http://www.chemtutor.com/gases.htm