Vacuum

What is the method used in laboratories to create a vacuum?

• Adding more gases to the air

• Cooling the air

• Removing gases from the air

• Heating the air

Why is it impossible to create a perfect vacuum?

• Due to technological limitations

• Because of the presence of air

• Because of the laws of physics

• Because some gases always remain

What is the main challenge in creating a perfect vacuum?

• The cost of equipment

• The time required

• The need for advanced technology

• The presence of residual gases

What is found in deep space despite the vacuum?

• Hydrogen atoms

• Oxygen molecules

• Nitrogen gas

• Carbon dioxide

How many hydrogen atoms are typically found per cubic meter in deep space?

• None

• Thousands

• A few

• Millions