Atmospheric pressure

• What is the Earth's atmosphere primarily made of?

  Nitrogen
• Why is oxygen important in the atmosphere?

  It allows us to breathe
• What role do greenhouse gases play in the atmosphere?

  They keep the planet warm
• What does the ozone layer do?

  It keeps out harmful radiation
• Where is the density of gas particles highest in the atmosphere?

  Near the Earth's surface
• What happens to atmospheric pressure as you move away from the Earth?

  It decreases
• How does atmospheric pressure relate to elevation above sea level?

  Pressure decreases with higher elevation
• What is the relationship between air particles and pressure at sea level compared to 1,000 meters up?

  More air particles at sea level create higher pressure
• Why does an object at sea level experience more collisions with air particles?

  There are more air particles around it
• How does the pressure equation relate to force and collisions?

  More collisions mean greater force and pressure
• What contributes to the pressure experienced by an object at sea level?

  The weight of gas particles above it
• Why does an object at 1,000 meters experience less pressure?

  Fewer gas particles are above it
• Why do mountain climbers need to carry oxygen cylinders?

  Air is too thin to breathe
• What are the main factors affecting atmospheric pressure?

  • Density of gas particles
  • Weight of gas particles above
• How does atmospheric pressure change with elevation?

  • Pressure decreases as elevation increases
  • More air particles at lower elevations
  • Less weight of gas above at higher elevations