Question 3: [citation needed] Americans who take their grills overseas — such as military personnel — can find U.S.-specification propane at ________ military post exchanges.
Question 6: When used as vehicle fuel, it is commonly known as ________ (LPG or LP-gas), which can be a mixture of propane along with small amounts of propylene, butane, and butylene.
Question 10: The processing of natural gas involves removal of butane, propane and large amounts of ________ from the raw gas, in order to prevent condensation of these volatiles in natural gas pipelines.