the difference between accumulation and ablation on a glacier for a given year.

describes the net gain or loss of snow and ice through a given year. It is usually expressed in terms of water gain or loss. Medial Moraine These form where two mountain glaciers bearing lateral moraines unite. They appear as dark streaks of rock along the glacier centerline. The small object near the lower center is a six person pyramid tent.

the difference between accumulation and ablation on a glacier; usually calculated on an annual basis.

the quantification of total materials into and out of a process with the difference between inputs and outputs being accounted for as a release to the environment or as part of the facility's waste (NPI website — Emission Estimation Technique Manual for Iron and Steel Production).

A scientific approach that studies the sources, movement, and destination of any substance, for example a contaminant, that enters a lake system. A mass balance budget for a particular pollutant is the amount that enters a lake minus the amount that is tied-up in the sediment, broken down by chemical or biological processes, or removed by some other means. This should equal the amount that flows out of the lake system. This exercise enables scientists to assess the possible long-term effects of a pollutant and possible remediation actions. Also see "Lake Michigan Mass Balance Study," "Great Lakes Toxic Reduction Effort," "Lakewide Management Program."

The application of the principle of the conservation of matter.

MassBalance is an edutainment computer game project done by the WPI Game Development Club in conjunction with the Boston Globe and Massachusetts Senator Richard T. Moore's office.

algebraic sum of the total quantity of the substance lost by the patient during dialytic treatment and the amount gained by the dialysate, by exchange through the membrane.

The process of adding together the assay value and levels of degradation products to see how closely these add up to 100 percent of the initial value, with due consideration of the margin of analytical precision

Weight attached to control surface; reduces or eliminates flutter