Dehydration is the excessive loss of fluids in the body. Low levels of calcium and potassium may also cause muscle cramps, since both minerals contribute to healthy muscle function. Low blood supply to your legs and feet can cause cramping in those areas when you exercise, walk, or participate in physical activities.
Physical properties of materials and systems can often be categorized as being either intensive or extensive quantities, according to how the property changes when the size (or extent) of the system changes. According to IUPAC, an intensive property is one whose magnitude is independent of the size of the system.
Thermodynamic properties are divided into two broad types: intensive properties and extensive properties. An extensive property is any property that depends on the size (or extent) of the system under consideration. Volume is an example. If you double the length of all edges of a solid cube, the volume increases by a factor of eight. Mass is another.