Scleral lenses have gained popularity in the last decade. From a lens with limited viability for over 100 years to the fastest growing segment of the gas permeable lens market, scleral lenses have come a long way.
Mass and Weight. The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else.
Anything that has mass and takes up space. (E6) It is all of the gases, liquids, and solids in the world around you -- the air you breathe, the water you drink, and the chair you sit on. Define Mass: ____________. Is a measure of the amount of matter in an object.