Tropical Air Mass: An air mass that forms in the tropics or subtropics over the low latitudes. Maritime tropical air is produced over oceans and is warm and humid, while continental tropical air is formed over arid regions and is very hot and dry.

 

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Tropical Air Mass: An air mass that forms in the tropics or subtropics over the low latitudes. Maritime tropical air is produced over oceans and is warm and humid, while continental tropical air is formed over . . . View Full Definition

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 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 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.

Massage Therapist: A person who practices therapeutic massage. In many US states, massage therapists can be licensed after completing a specified training program. Licensed therapists may practice independentl . . . View Full Definition

Massage Modality Or Technique: A kind of massage, such as Swedish, deep tissue or myofascial release.

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

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