“mass balance”的概念、定义、翻译、参考文献-科学参考

mass balance

Chemical Engineering

The analysis of a process in which the total mass of the chemical reactants is correlated with the total mass of the products according to the law of conservation of mass. Where there is an inequality, there is either an unaccounted loss or accumulation within the process. A mass balance calculation is used in the design stage of a process. It is also used during process operation as a form of inventory or accountancy. It is also known as a material balance.

Geology and Earth Sciences

1. Generally, a term used in comparisons of the inputs and outputs of processes.
2. The balance of elements in ocean water, which is assumed to be constant, i.e. influx and removal of elements occurs at the same rate. Influxes include river water, elements released from sediment pore fluid, and melting ice. Reaction between sea water and rocks is probably insignificant. The removal of elements from sea water occurs by precipitation of chemical sediments, ion exchange, and the burial of pore fluids.
3. The relation between the input and output of a glacier. Input (accumulation) is dominated by snow precipitation and output (ablation) by surface melting. The difference between accumulation and ablation for a glacier over a year is the net (mass) balance. A positive net balance implies that a glacier is growing; a negative net balance that it is shrinking; and a zero net balance that it is stable.

Geography

The relationship between the masses of the components of a landform, particularly in glaciers, where zero mass balance describes a situation where accumulation balances ablation, a positive mass balance describes an increase in glacier mass, and a negative mass balance describes a reduction in glacier mass. See M. M. Bennett and N. Glasser (2009), p. 43, for an excellent summary of mass balance and global sea-level rise. Alexander et al. (2011) Geograf. 93, 1, 41 describe a simple steady-state mass-balance model for the Franz Josef glacier, New Zealand.

单词	mass balance
释义	mass balance Chemical Engineering The analysis of a process in which the total mass of the chemical reactants is correlated with the total mass of the products according to the law of conservation of mass. Where there is an inequality, there is either an unaccounted loss or accumulation within the process. A mass balance calculation is used in the design stage of a process. It is also used during process operation as a form of inventory or accountancy. It is also known as a material balance. Geology and Earth Sciences 1. Generally, a term used in comparisons of the inputs and outputs of processes. 2. The balance of elements in ocean water, which is assumed to be constant, i.e. influx and removal of elements occurs at the same rate. Influxes include river water, elements released from sediment pore fluid, and melting ice. Reaction between sea water and rocks is probably insignificant. The removal of elements from sea water occurs by precipitation of chemical sediments, ion exchange, and the burial of pore fluids. 3. The relation between the input and output of a glacier. Input (accumulation) is dominated by snow precipitation and output (ablation) by surface melting. The difference between accumulation and ablation for a glacier over a year is the net (mass) balance. A positive net balance implies that a glacier is growing; a negative net balance that it is shrinking; and a zero net balance that it is stable. Geography The relationship between the masses of the components of a landform, particularly in glaciers, where zero mass balance describes a situation where accumulation balances ablation, a positive mass balance describes an increase in glacier mass, and a negative mass balance describes a reduction in glacier mass. See M. M. Bennett and N. Glasser (2009), p. 43, for an excellent summary of mass balance and global sea-level rise. Alexander et al. (2011) Geograf. 93, 1, 41 describe a simple steady-state mass-balance model for the Franz Josef glacier, New Zealand.
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