A sealed flexible packet is taken from sea level to a mountain top. Its temperature remains constant. The packet begins to expand. Which statement correctly links this observation to the atmosphere?
Less overlying air raises the external pressure, so the external pressure is initially greater.
More overlying air lowers the external pressure, so the internal pressure is initially greater.
More overlying air raises the external pressure, so the external pressure is initially greater.
Less overlying air lowers the external pressure, so the internal pressure is initially greater.
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.