Gases can be found everywhere around us. However, they are not visible or cannot be seen by the naked eye. Some examples of gases are oxygen, hydrogen, nitrogen and carbon dioxide. They are neither hard nor have fixed shapes or volumes. They can be filled into any shapes and volume of container as liquids do. On the other hand, gases can be compressed into different types or sizes of containers
Gas can fill any type of container. We can open the valve and the gas will be released whenever we need to utilise it. However, if the pressure exerted by the gases in the atmosphere is higher than the container, the container can be crumpled.
The particles that make up gas are completely separated from one another. For example, empty space accounts for more than 99 percent of the total volume of air. Since the particles are separated, the attractive force between the particles are small. This force is insufficient to hold gases in the air to form definite shape or volume. Thus, the gas can expand freely to fill the container. A litre of gas can expand to fill a two or more litre container because the gas molecules can move freely, allowing the gas to expand and fill any size of container.
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