Balloon payments: definition and benefits. Sometimes, it can be difficult to fathom out the world of finance. The industry is so littered with phrases that, if you tried to put serious time and effort into trying to decode the strange language used in the world of finance, your brain would probably melt!
Warm air molecules are further apart because they have a higher  speed. The higher the speed the further apart molecules will push  themselves.es. The molecules in a solid are tightly packed, making it hard. They also move, or vibrate very slow. The molecules in a liquid are a little less tight then those in a solid â¦ .
Iâll begin with an incorrect explanation for why air (or any other gas, for that matter) expands when you heat it. The reason Iâm doing this is that the following wrong explanation can be found in many science resources. Hot air molecules, on average, have more space between them than cool air molecules. Therefore, when you heat air it expands to allow more space for the molecules. If you then cool the air, it contracts because cool air molecules need less space than hot air molecules. To see why this is an incorrect explanation, imagine a bunch of gas molecules bouncing around inside a rigid container. They move at a constant speed until they run into another molecule or the walls of the container. In collisions, the molecules bounce off one another and off the walls like billiard balls. The molecules in a cool gas move slower, on average, than do molecules in a hot gas. This model is part of what is known as the kinetic theory of gases, and as a first approximation, it does a good job of explaining what gases do. Figure 1 shows a few gas molecules doing this.