Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: The pressure of a sample of gas is measured with an open-end manometer.
[A]: The pressure of a sample of gas is measured with an open-end what?


[Q]: Demagnetization is the process in which a magnet loses its magnetic properties.
[A]: What is the process called in which a magnet loses its magnetic properties?


[Q]: Most of a mushroom's surface area is actually underground.
[A]:
Most of a mushroom's surface area is actually where?