5.5.2 Atmospheric Pressure

• High atmospheric pressure makes breathing easier because the air is denser.
• Gravity creates atmospheric pressure by pulling air molecules towards Earth.


  True
• The pascal is the SI unit, while the millibar is more common in meteorology.
• Match the barometer type with its working principle:

  Mercury Barometer ↔️ Supports mercury column height

  Aneroid Barometer ↔️ Flexible metal box expands

  Digital Barometer ↔️ Measures pressure electronically
• Atmospheric pressure is measured in units of pascals or millibars
• Match the weather condition with its effect on atmospheric pressure:

  Low pressure system ↔️ Stormy weather

  High pressure system ↔️ Settled weather
• What happens to atmospheric pressure as altitude increases?

  Decreases
• Low-pressure systems bring settled weather.

  False
• How many pascals are equivalent to one millibar?

  100 Pa
• Breathing is easier in low-pressure conditions.

  False
• One millibar is equal to 100 pascals.
• Match the weather effect with atmospheric pressure:

  High Pressure ↔️ Settled, dry weather

  Low Pressure ↔️ Stormy, wet weather
• Arrange the factors affecting atmospheric pressure in order from most to least significant:

  1️⃣ Weather conditions

  2️⃣ Altitude
• What are the two main units used to measure atmospheric pressure?

  Pascal and millibar
• Low atmospheric pressure leads to higher boiling points of liquids.

  False
• What is atmospheric pressure defined as?

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

  False
• Steps explaining how atmospheric pressure is created:

  1️⃣ Air molecules are pulled towards Earth by gravity

  2️⃣ Gravity induces weight of air

  3️⃣ Air weight results in pressure
• Atmospheric pressure is measured in units of pascals or millibars
• Match the unit of pressure with its definition:

  Pascal (Pa) ↔️ SI unit of pressure

  Millibar (mb) ↔️ 1 mb = 100 Pa
• High-pressure systems bring settled, dry weather
• What is the SI unit of atmospheric pressure?

  Pascal (Pa)
• Millibars are preferred in scientific contexts.

  False
• What is a key disadvantage of mercury barometers?

  Bulky and contains mercury
• The aneroid barometer uses a sealed, flexible metal capsule that changes shape with pressure.