Understanding the gas laws
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Malaysia SPM Form 4, Chapter 4: Heat
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Understanding the gas laws is the last subtopic in heat. In understanding of gas law, we discuss the relationship between the volume, the pressure and the temperature of a confined gas. The relationship between the pressure and the volume of a gas is discussed in Boyle's law. The relationship between the temperature and the volume of a gas is discussed in Charles' law whereas the relationship between the pressure and the temperature of a gas is discussed in Pressure law. There is also a law that relates all the 3 properties of the gas, called the universal gas law.
In SPM, you need to know:
- the statement of each law, including the requirement of the law.
- the graphs that related to each law.
- the physics equation that related to each law
- how to solve problems related to each law.
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[edit] Boyle's Law
Boyle's law states that the pressure of a gas with constant mass is inversely proportional to its volume provided the temperature of the gas is kept constant.
There are 2 things important in this law. First, to apply this law, the temperature must be constant. This is the requirement of Boyle's law. Second, the pressure of a gas is inversely proportional to the volume of the gas, which means, when we reduce the volume of the gas in a container, the pressure of the gas will increase. If the volume is reduce by 2 times then the pressure will increase by 2 times. If the volume is reduce by 3 times then the pressure will increase by 3 times.
[edit] Explanation
In SPM, sometime you will be asked to explain why the pressure of a gas will increase when its volume decreases, by using kinetic theory of gas. You should have learn the kinetic theory of gas in form 4 SPM Physics chapter 3, Force and Pressure.
[edit] Charle's Law
Charles’s Law states that for a fixed mass of gas, the volume of the gas is directly proportional to the absolute temperature provided the pressure remains constant.
[edit] Pressure Law
Pressure states that for a fixed mass of gas, the pressure of the gas is directly proportional to its absolute temperature if the volume remains constant.
[edit] Universal Gas Law
[edit] Frequently Asked Question
[edit] Additional notes
[Additional notes content information relates to this topic but may not be in the SPM syllabus]
