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.
Butanone, also called methyl ethyl ketone (MEK) and Butan-2-one, is a chemical compound which is commonly used as a solvent in the manufacture of many products. Butanone's molecular formula can be written in either of two ways, with the first one being most common: