Gas+Temperature+and+Pressure!

 __Gas Temperature and Pressure. __

 If the volume of the container is not fixed, when the temperature rises, the gas would expand. And it would increase the volume. Like, an example of this is similar to gas in a balloon. This is why, when you let a balloon go into the sky, it pops when it does. As it gets closer and closer to the sun, the gas molecules expand. I remember, when I was little, and I would always wonder why the balloon popped in the sky, I guess I know now.

But otherwise, if the volume is fixed, then, the increasing temperature will make the pressure rise. And this means that when the temperature decreases, so will the pressure. This would be like gas closed in a container. Such as a canister or a sealed metal box.

Now, you may be confused because, you know how hot air balloons have a flame under them? That makes the temperature of the air in the balloon expand, so why doesn't the balloon pop? Well, the amount of gas and the size of the flame is controlled by the pilot to make sure these kinds of things do not happen.

Now, let's get onto pressure. When you increase the pressure the gas molecules will "contract" (or become smaller). Which reduces the volume. And if you decrease the pressure, the gas will expand. And this is when the volume is not fixed. When the volume is fixed, then increasing the pressure, will increase the temperature. And decreasing the pressure will decrease the temperature.

Another fact is gases can also be changed to a liquid or solid if the temperature is low, or the pressure is too high. One example of this is when steam changes to a liquid when it touches a cold object. Thanks To: http://cache.eb.com/eb/image?id=62948&rendTypeId=4 http://wiki.answers.com/Q/How_does_temperature_and_pressure_affect_gases