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.
exists and is an alternate of . Making the world better, one answer at a time. In the study of natural gas iC4 is known as isobutane, where as nC4 is normal butane. In the study of natural gas&nbsp;iC4 is known as&nbsp;isobutane, where as nC4&nbsp;is&nbsp;normal butane.