Pressure is proportional to temperature!

Back to Energy

When the pressure increases, the temperature increases.

The fire syringe is a good example. As you saw in class, it was possible to light cotton on fire by pressing down on the plunger. Pressing on the plunger increased the pressure and raised the temperature high enough to light some cotton on fire!

Mountain height: There is a limit to how high mountains can be! Bigger mountains exert huge pressures on the rock under it. Huge pressures translate into huge temperatures that will result in melting the rock and essentially sinking the mountain.

 

When the pressure decreases, the temperature decreases too.

Have you ever noticed that aerosol underarm deodorants feel cold when you spray them on? This is why: The contents of the can are under pressure at room temperature. When you spray the contents out, the pressure decreases and so does the temperature.

Cold mountain air: The air temperature on the top of a mountain is lower because the pressure is less. Remember that pressure is proportional to temperature. Think about it. Since you are high up, there is less air above you, and therefore, less pressure. Low pressure means cold temperatures.

 Back to Energy