By: Group 1

There are three types of matter: Solid Liquid Gas

Temperature is not directly tied to volume, its related to pressure. Increasing the temperature will increase the pressure. Only if volume is held constant. That is were volume and temperature are related, through pressure. However, if you increase the volume it does not change the temperature.

The expansion of a solid when heated is small. A meter ruler may expands by 1 – 2 mm when heated. Through small, this expansion can create a very large force if it is restrained. Railway tracks expand during a hot day. If the tracks are not designed for the expansion, the entire track may bend out of shape during expansion.

Liquid also expands for the same reason. However, since liquid particles are usually less tightly bound to each other molecules, they generally move further than solid particles when heated. Liquid expands more than solid if the temperature rise is the same. This expansion of liquid may be used in a liquid-in-glass thermometer. The volume increase of alcohol or mercury may be calibrated to provide a temperature reading since the expansion is almost directly proportional to the temperature rise.

Gases behave differently from solids and liquids. Gas molecules are far apart and weakly attracted to each other. Heat causes the molecules to move faster and the volume increases much more than solids and liquids. However, gas do not have to expands when heated. If the gas is confined to a fixed volume, the increase in temperature may cause the pressure to increase if the volume of kept constant.