This makes calculations much easier.ģ) Gases are Higher Energy than Solids or Liquidsīecause of the energy of a gas, we often define gases by different physical properties than we use for solids and liquids. What this means for a chemist is that the volume of a gas can be assumed to be the same as the volume of the container it is placed in.
You can smell gases from processes like wood/paper treatment plants or barbeque restuarants from long distances because of this expansion. This means that they will spread until contained.
The expansion of gases is easy to understand since the molecules are moving rapidly through space and only turn when they collide with another molecule or object. This is how CO 2 is formed into dry ice.Ģ) It Expands to Fill the Container in which it is Placed: If the compression were to continue, the gas could be forced into a solid state. The compression does not force the molecules to be in contact with each other necessarily, just brings them closer together until they are in a more liquid state than gaseous. Thecompressibility ofa gas comes from the large amount of space between the molecules of a gas in its normal state. It is compressed into tanks to make its distribution easier. Propane is a gas we use for both heating and cooking. The ability of a gas to be compressed means we can take a large amount and reduce it into a smaller space to make it easier to transport and use. Let's look at each property separately and make sure we understand its meaning. We discussed gases as a phase of matter earlier in the course and here we will review those properties in more detail.Ī gas has 3 main characteristic properties that separate it from other forms of matter:Ģ) It expands to fill the container in which it is placed.ģ) Its molecules move faster than those of either liquids or solids - meaning it is higher energy. In this lecture we cover the properties of gases, the units of pressure and the use of a manometer to measure pressure.
The content that follows is the substance of lecture 17.
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