Читать книгу Fundamentals of Heat Engines - Jamil Ghojel - Страница 27

Mass is a measure of inertia and quantity of the body of matter (fluid), m (kg).

Weight is the force with which a body of the fluid is attracted towards the earth by gravity:

Density is the amount of mass per unit volume:

Specific weight is the weight of a unit volume of a substance:

Specific gravity is

where subscripts f and w are for fluid and water, respectively.