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gas

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Secondary Information

Definition

Gas is a state of matter that has no definite shape or volume. Gases can expand to fill any container they are in. This is because the particles in a gas are very far apart from each other.

The particles in a gas are constantly moving. They are moving in all directions at all times. This is why gases can be compressed. When you compress a gas, you are forcing the particles closer together. However, when you release the pressure, the particles will spring back to their original positions.

Gases are made up of molecules. These molecules are very small, and they are made up of even smaller particles called atoms. The type of atoms in a molecule determines the properties of the gas. For example, oxygen gas is made up of two oxygen atoms. Nitrogen gas is made up of two nitrogen atoms.

Gases are important in many different ways. They are used in cars, aeroplanes, and other vehicles. They are also used in factories to produce many different products.

How can the word be used?

The air is a mixture of gases.

gas

Different forms of the word

Noun: gas, gases.

Adjective: gaseous.

Verb: gas, gassed, gassing.

Etymology

The word "gas" comes from the Greek word gázein, which means "to emit, to exhale". The Greek word gázein is related to the Latin word gas, which also means "to emit".

Question

What things are powered by gas?

AQA Science Exam Question and Answer

Question: What are the properties of gases?

Answer:

Gases are a state of matter that has no definite shape or volume. They are made up of molecules that are far apart from each other. The properties of gases include:

  • No definite shape: Gases have no definite shape because the molecules are far apart from each other. The shape of a gas is determined by the container that it is in.
  • No definite volume: Gases have no definite volume because the molecules are far apart from each other. The volume of a gas is determined by the pressure and temperature of the gas.
  • Compressible: Gases are compressible because the molecules are far apart from each other. This means that they can be squeezed into a smaller volume.
  • Diffuse: Gases diffuse, or spread out, to fill the container that they are in. This is because the molecules are constantly moving and colliding with each other.
  • Evaporate: Gases evaporate, or turn into a gas, from liquids. This is because the molecules of a liquid are constantly moving and some of them have enough energy to escape from the surface of the liquid.

Gases are a versatile state of matter that have many different properties. They are used in a variety of applications, including:

  • Transport: Gases are used to transport goods and people. For example, natural gas is used to heat homes and businesses.
  • Manufacturing: Gases are used in manufacturing a variety of products. For example, nitrogen is used to cool lasers in the manufacturing of semiconductors.
  • Medical: Gases are used in medicine for a variety of applications. For example, oxygen is used to treat people who have difficulty breathing.