Atmospheric Pressure

• What surrounds the Earth and creates atmospheric pressure?

  The atmosphere
• How is atmospheric pressure created on a surface?

  By air molecules collecting on that surface
• What happens to atmospheric pressure as altitude increases?

  It decreases
• What is the relationship between altitude and the number of air molecules above a surface?

  Fewer air molecules are above as altitude increases
• Why does atmospheric pressure decrease with altitude?

  Because the atmosphere gets less dense
• How does the weight of air contribute to atmospheric pressure at higher altitudes?

  The weight of air decreases with altitude
• What is the definition of atmospheric pressure?

  Pressure created by air molecules on a surface