# The Kinetic Molecular Theory: Why Gases Behave The Way They Do

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The Kinetic Molecular Theory explains why gases behave the way they do. It explains how gas particles are in constant motion and create collisions that results in pressure. The theory is split up into four different postulates. Number one explains how gases are made up of tiny particles. To prove that those particles take up space, postulate #2 tells us that the particles collide with each other and those collisions make pressure. Pressure can either expand or shrink a flexible container, depending on how many particles are in that container. If there are more particles then more collisions will happen creating more pressure. If there are less particles, then there are less collisions resulting in less pressure. Postulate #3 explains in …show more content…
For example, a blown up balloon can either expand or shrinks depending on the collisions/pressure inside. When the temperature gets higher the particles move faster because they have more kinetic energy which causes more collisions leading into more pressure expanding on the balloon. Same goes for a cooler temperature, but the opposite happens, the particles move slower which causes less collisions, leading to less pressure pushing against the balloon. Gases have a property of pressure. This can be proven by the Kinetic Molecular Theory. Gases are consisted of particles, those particles have collisions with each other (2) and collisions create pressure (2). For example, we did a lab in class that had to deal with pressure. The lab was filling a test tube with water and putting it upside down with a piece of plastic covering the opening. The results were that the plastic stayed and the water did not flow out. This is because there is 1 atm of pressure outside the tube. Meaning, there are more collisions outside the test tube that are pushing against the plastic with the created pressure(2). The water can’t flow out because there is no pressure inside the test tube pushing down on the plastic. There is only pressure pushing up the plastic. Gas also has a property of