Muscle cramps may be brought on by many conditions or activities, such as: 1  Exercising, injury, or overuse of muscles. 2  Pregnancy. Cramps may occur because of decreased amounts of minerals, such as calcium and magnesium, especially in the later months of pregnancy.  Exposure to cold temperatures, especially to cold water.
Butane is a colorless gas with a faint petroleum-like odor. For transportation it may be stenched. It is shipped as a liquefied gas under its vapor pressure. Contact with the liquid can cause frostbite.
Quick Answer. The main difference between propane and butane gas is their chemical structure. Although they are both composed of carbon and hydrogen chains, the number of carbons and hydrogens in each differ slightly. Propane, for instance, is composed of a three-carbon chain with eight hydrogens.