Lean Body Mass: Everything in the body except for fat, including bone, organs, skin, nails and all body tissue including muscle. Approximately 50-60% of lean body mass is water.

 

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Lean Body Mass: Everything in the body except for fat, including bone, organs, skin, nails and all body tissue including muscle. Approximately 50-60% of lean body mass is water.

Mass Spectrometry: A method for experimentally determining isotopic masses and isotopic abundances. A sample of an element is converted into a stream of ions and passed through an electromagnetic field. Ions w . . . View Full Definition

Mass Spectrum: A plot showing the results of a mass spectrometry experiment, which shows the presence of particles with different masses as a series of sharp, separate peaks. The position of the peaks on t . . . View Full Definition

Mass Wasting: A general term used for any downslope movement of rock, soil, snow or ice under the influence of gravity. Includes: landslides, creep, rock falls and avalanches.

Mass Spectrometer: An instrument that measures the masses and relative abundances of a sample that has been vaporized and ionized.

Mass Percentage: Mass percentages express the concentration of a component in a mixture or an element in a compound. For example, household bleach is 5.25% naocl by mass, meaning that every 100 g of bleach c . . . View Full Definition

Mass Extinction: A time during which extinction rates are generally accelerated so that more than 50% of all species then living become extinct; results in a marked decrease in the diversity of organisms. Ma . . . View Full Definition

Mass Movement: A downhill movement of soil or fractured rock under the force of gravity.

Mass Number: The total number of protons and neutrons in an atom or ion. In nuclide symbols the mass number is given as a leading superscript. In isotope names (e. G. Carbon-14, sodium-23) the mass numbe . . . View Full Definition

Massage: The manipulation of muscle and connective tissue to enhance the function of those tissues and promote relaxation and well-being. Therapeutic massage can ease tension and reduce pain. Massage . . . View Full Definition