Pressure in Fluids (T)

• What should you be able to calculate by the end of the video?

  Calculate the pressure of a fluid acting at a surface.
• Why does atmospheric pressure decrease with an increase in height?

  Because the number of air molecules above decreases with height.
• What is the definition of a fluid in scientific terms?

  • Gases and liquids are classified as fluids.
  • They exert force when particles collide with surfaces.
• What is the equation used to calculate pressure?

  Pressure = Force (N) / Area (m²)
• What is the unit of pressure?

  Pascal
• How do you calculate the pressure exerted by a fluid?

  • Use the equation: Pressure = Force / Area
  • Force is in Newtons and Area is in square meters.
• If a gas applies a force of 400,000 Newtons over an area of 8 m², what is the pressure?

  50,000 pascals
• Why do crisp packets swell up in airplanes?

  • The air pressure inside the bag is greater than the cabin pressure.
  • This difference in pressure causes the bag to inflate.
• What happens to atmospheric pressure as altitude increases?

  Atmospheric pressure decreases.
• What is the relationship between air pressure and oxygen supply for mountain climbers?

  • Air pressure decreases at high altitudes.
  • Low air pressure may not provide sufficient oxygen.
• How does the pressure inside a crisp packet compare to the cabin pressure during a flight?

  The pressure inside the packet is greater than the cabin pressure.