A scientist investigates how the pressure and volume of a gas inside a flexible underwater container are related when submerged at different depths.
The results from their experiment are shown in the table.
| Pressure (kPa\text{kPa}kPa) | Volume (cm3\text{cm}^3cm3) |
|---|---|
| 150 | 1200 |
| 300 | 600 |
| 450 | 400 |
| 600 | 300 |
| 900 | 200 |
Explain how these results show that pressure×volume=constant\text{pressure} \times \text{volume} = \text{constant}pressure×volume=constant. Use calculations in your answer.
The graph shows the scientist's results, but one point is missing.
State the coordinates of the missing point that needs to be plotted on this graph.
Describe the line of best fit that should be drawn on the graph.
Calculate the volume of gas when the pressure is 500 kPa500\text{ kPa}500 kPa.
Explain how and why atmospheric pressure changes with height above the surface of the Earth.