Molecules are in constant motion, even if we are unable to see them due to their small size. We can see the effects of this motion and understand some basics about molecular motion. Matter is made up of molecules, which are in constant motion (as already stated), however there are restorative forces than force the molecules back to their original position. In case of solids, these forces are strongest and hence molecule return back to...
Molecules are in constant motion, even if we are unable to see them due to their small size. We can see the effects of this motion and understand some basics about molecular motion. Matter is made up of molecules, which are in constant motion (as already stated), however there are restorative forces than force the molecules back to their original position. In case of solids, these forces are strongest and hence molecule return back to their original positions and that is why solids are rigid. In comparison, liquids have weak restoring forces, which causes a lack of fixed shape in case of liquids and molecules are able to cause changes in liquid shape (as the liquid is transferred to a differently shaped container). The restoring forces are totally absent in gases and that is why gases have no shape and it is so easy for smoke to disperse. We can aid the motion of individual molecules by heating the substance. Heat provides kinetic energy to molecules and help them move faster. This is why (and how), solids can be converted to liquids (through melting) and liquids to gases (through vaporization). We can also reduce the molecular motion by decreasing their temperature.
Hope this helps.
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