Question

Give a Reason:

Solids expand the least and gases the most on heating.​

Answer 1

Explanation:

Explanation: The greater the attraction between the molecules, the smaller the expansion will be. Solids expand the least and gases expand the most when heated because this attraction is greatest in solids and least in gases.

Answer 2

The changes in all three matters that occur when they are heated.First, considering solid, it is observed that when a solid is heated, its atoms vibrate faster about their fixed points. So, the relative increase in the size of solids when heated is small. For example, metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and do not buckle.

Also, l expand for the same reason, however they expand more than solids because the bonds between separate molecules are usually less tight. This is the concept used in the liquid-in-glass thermometers. An increase in temperature results in the expansion of the mercury which means it rises up the glass.

Finally, molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster. Here, heat energy is converted to kinetic energy which means that the volume of a gas increases more than the volume of a solid or liquid.Thus, we can say that the given statement is true.