Understanding Atmospheric Pressure

The video tutorial explains atmospheric pressure as the weight of air molecules above a given area. It covers the concept of pressure as force per unit area and provides examples to calculate the force exerted by the atmosphere over a surface. The tutorial also demonstrates how to calculate the pressure exerted by air in a closed box and the mass of air in a vertical column using atmospheric pressure and area. Key concepts include understanding pressure, force, and the role of air molecules in exerting pressure.

What is the basic definition of pressure?

• The distance covered by a force

• The force applied over a distance

• The area covered by a force

• The force applied over an area

What is atmospheric pressure at sea level in pascals?

• 101 pascals

• 1,013 pascals

• 10,132 pascals

• 101,325 pascals

How does increasing the area affect the weight force exerted by the atmosphere?

• It decreases the weight force

• It increases the weight force

• It has no effect on the weight force

• It doubles the weight force

What is the formula to calculate force exerted by the atmosphere?

• Force = Area / Pressure

• Force = Pressure x Area

• Force = Pressure / Area

• Force = Area x Pressure

What is the pressure exerted by air in a closed box dependent on?

• The color of the box

• The weight of the box

• The density of the air

• The volume of the box

How is the mass of air in a vertical column calculated?

• By subtracting area from pressure

• By dividing pressure by area and multiplying by gravitational acceleration

• By multiplying pressure with area and dividing by gravitational acceleration

• By adding pressure and area

Why is it important to use pascals instead of atm in calculations?

• Because pascals are the standard unit for pressure

• Because atm is not a real unit

• Because pascals are easier to calculate

• Because pascals are larger than atm

What is the gravitational acceleration used in these calculations?

• 9.8 m/s²

• 10 m/s²

• 8.9 m/s²

• 9.0 m/s²

What is the unit of pressure in the SI system?

• Bar

• Atmosphere

• Pascal

• Newton

What does 1 atm of pressure represent?

• The pressure exerted by air at sea level

• The pressure exerted by water at sea level

• The pressure exerted by a single air molecule

• The pressure exerted by air in outer space