Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Millibar is the unit used to measure air pressure.

Answer: What is the unit used to measure air pressure?

Question: How much is involved in the reaction does the coefficient in front of an element in a formula indicate.

Answer: What does the coefficient in front of an element in a formula indicate?

Question: Rh is the common abbreviation for noting the rhesus blood type.

Answer:
What is the common abbreviation for noting the rhesus blood type?