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# temperature

#### Definition

Temperature is the quantitative statement concerning heat. The only temperature scale with an absolute basis in nature is the Thermodynamic Kelvin Temperature Scale (TKTS), which is based on functions that can be deduced directly from the first and second laws of thermodynamics. Since the lower limit of the TKTS is absolute zero, and since it is linear by definition, only one non-zero reference point is required to establish its slope. The reference point of 0^{0}C was chosen because it is the equilibrium temperature of water in its liquid and solid phases at atmospheric pressure. The zero of the Celsius scale is 273.l5K and any given C^{0}, t corresponds to the absolute temperature T=t+273.l5. Temperature in aquaculture operations is usually expressed in degrees Celsius.