5.5.2 Atmospheric Pressure

• What is atmospheric pressure defined as?

  Force per unit area
• Atmospheric pressure decreases as altitude increases.
• Match the altitude with the corresponding atmospheric pressure level:

  Sea Level ↔️ High

  Higher Altitudes ↔️ Low
• Which instrument is used to measure atmospheric pressure?

  Barometer
• A mercury barometer uses a flexible metal box to measure atmospheric pressure.

  False
• An aneroid barometer uses a flexible metal box that expands or contracts with changes in atmospheric pressure
• Match the type of barometer with its mechanism:

  Mercury Barometer ↔️ Uses a mercury column

  Aneroid Barometer ↔️ Uses a flexible metal box
• The density of the fluid is a factor in calculating atmospheric pressure.
• Why does atmospheric pressure decrease as altitude increases?

  Less air above
• Atmospheric pressure is measured using a barometer, which balances the weight of the atmosphere against a fluid column
• What is the function of the mercury column in a mercury barometer?

  Measures atmospheric pressure
• An aneroid barometer is more accurate than a mercury barometer.

  False
• Atmospheric pressure affects weather patterns, breathing, and the boiling points of liquids
• How does high atmospheric pressure typically affect weather patterns?

  Clear skies
• Lower atmospheric pressure makes breathing easier.

  False
• What happens to the boiling point of liquids when atmospheric pressure decreases?

  It decreases
• Atmospheric pressure is calculated using the formula $P =$$\rho g h$, where $\rho$ is the density of the air
• Calculate the atmospheric pressure at sea level if the air density is 1.225 kg/m³, gravity is 9.81 m/s², and the air column height is 10,000 m.

  120,172.5 Pa
• Match the variable with its unit:

  Atmospheric Pressure ↔️ Pascals (Pa)

  Density of Air ↔️ kg/m³

  Acceleration due to Gravity ↔️ m/s²

  Height above Ground ↔️ Meters (m)
• A mercury barometer is highly sensitive to temperature changes.
• What is atmospheric pressure caused by?

  Weight of the air above
• Atmospheric pressure increases with altitude.

  False
• As altitude increases, atmospheric pressure decreases
• What does the variable $\rho$ represent in the atmospheric pressure formula?


  Density of air
• Match the type of barometer with its mechanism:

  Mercury barometer ↔️ Uses a mercury column

  Aneroid barometer ↔️ Uses a flexible metal box
• Calculate atmospheric pressure at sea level using the given values:

  120,172.5 Pa
• High atmospheric pressure typically leads to clear skies.
• Inhalation requires the pressure inside the lungs to be lower than atmospheric pressure
• What happens to the boiling point of water when atmospheric pressure decreases?

  It decreases
• What is the unit for atmospheric pressure?

  Pascals (Pa)
• Altitude is one of the main factors influencing atmospheric pressure.
• Higher temperatures lead to lower atmospheric density
• How does atmospheric pressure change with altitude?

  Decreases
• Atmospheric pressure decreases with increasing altitude.
• Atmospheric pressure is measured using a barometer
• Match the type of barometer with its description:

  Mercury barometer ↔️ Uses a mercury column

  Aneroid barometer ↔️ Uses a flexible metal box
• An aneroid barometer uses a flexible metal box
• What are the two primary types of barometers?

  Mercury and Aneroid
• What instrument is used to measure atmospheric pressure?

  Barometer
• A mercury barometer uses a mercury column to measure atmospheric pressure.