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

Input: Consider Input: The pressure of a sample of gas is measured with an open-end manometer.

Output: The pressure of a sample of gas is measured with an open-end what?

Input: Consider Input: A(n) an ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.

Output: What forms when the metal sodium gives up an electron to the nonmetal chlorine?

Input: Consider Input: Chemical digestion mainly occurs in the small intestine.
Output: Where does chemical digestion mainly occur?