What are the Four Gas Laws in Chemistry?

The gas laws are often used to predict the behaviour of gaseous substances when they are placed under certain physical conditions. Examples of gas laws include Gay-Lussac’s law, Charles’ law, and Boyle’s law. The four gas laws provide relationships between the following quantities:

  • The pressure exerted by a gas on the walls of its container (denoted by ‘P’)
  • The absolute temperature of the gas (denoted by ‘T’ and measured on the Kelvin scale)
  • The number of moles of the gas, which can be visualized as the amount of gaseous substance (denoted by ‘n’)
  • The total volume that is occupied by the gaseous substance (denoted by ‘V’ and measured in litres)

Boyle’s Law

Boyle’s law states that the pressure exerted by gaseous substances on the walls of their containers increase as the volume of their containers decrease, as long as the absolute temperature of the gas and the amount of gaseous substance are kept constant.

This law can be mathematically expressed as:
P = k/V (or) PV = k

Where P is the pressure of the gas, V is the volume of the gas, and k is a constant.

Charles’ Law

The statement of Charles’ law can be written as – “When the amount of gaseous substance and the pressure associated with the gas is kept constant, the volume occupied by a gaseous substance is always proportional to the absolute temperature of the gas”.

The mathematical expression of Charles’ law is:

V/T = k (or)  V = kT

Where V is the volume of the gas, T is the absolute temperature associated with the gas, and k is a constant.

Avogadro’s Law

A relationship between the amount of gaseous substance and the volume of the gas is provided by Avogadro’s law. The statement of this law can be written as follows – “if the absolute temperature associated with gas and the pressure exerted by it with it is kept constant, the amount of gaseous substance is directly proportional to the volume of the gas”.

The equation for Avogadro’s law can be written as:

V/n = k (or) V = k*n

Where V is the volume occupied by the gas, n is the number of moles of gaseous substance, and k is a constant. For more engaging content on the four gas laws and other interesting chemistry concepts, subscribe to the BYJU’S YouTube channel and enable notifications.


5 Points to Remember When You Have to Write an Essay Fast

It may happen that you have to write an essay at short notice. You may have less than 24 hours to create a piece of art. Before you start writing, you need to make a decent plan. will help you write fast to meet your college deadline.

In this article, you will get a bunch of practical essay writing tips.

Plan your time

Find out how much time you have in your hand to make your paper ready. If you need to complete your essay within one hour, then give 20 minutes for research, brainstorming and structuring. Do not take the importance of revision for granted, as it will polish your essay.

Read your essay question

This is the most crucial step because you need to find out what you have to write. After reading the question or topic assigned by your university professor, you will get a quick answer in your mind. This will help you understand what you need to write to do justice with the assigned topic. Do not write anything that comes to your mind because you do not have to fill the paper. You have to write in accordance to the topic and provide the necessary details.


Proper research will help you get specific information about the topic. Figure out the key points you are going to use in your assignment. Remember that you do not have to write a long essay and above all, you do not have time to go in every minute detail. So stay concise in your research and writing. Take services to complete your essay at short notice.


This will help you break the essay in different paragraphs. You can give four or five headings in your essay. Start with writing a proper introduction and at last do not forget to write a conclusion. Write a main point and give evidence to support it. When you are giving details, make sure that your every sentence is connected to the thesis statement.

Write a solid introduction and conclusion

Gather enough material to write main body of the article. You will give authentic details to support your point of view. You can collect all this information and more by conducting a research. However, you have to write a solid introduction and conclusion at your own. A well-written introduction will awaken the interest of readers whereas a conclusion will make them understand the whole article in the right manner.