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Cal-th (kg-cal-th) Cal th: 1.0 Cal th (4.2 ... kilocalorie (15°C) kcal-15 (g-cal-15) kcal 15: 1.0 ...
Calorie (15°C) Cal-15 (kg-cal-15) Cal 15: 1.0 ... Mcal-15 (g-cal-15) Mcal 15: 1.0 Mcal 15 (4.2 MJ) kilocalorie (15°C) kcal-15 (g-cal-15) kcal 15: 1.0 ...
Other units still in use worldwide in some contexts are the kilocalorie per gram (Cal/g or kcal/g), mostly in food-related topics, and watt-hours per kilogram (W⋅h/kg) in the field of batteries. In some countries the Imperial unit BTU per pound (Btu/lb) is used in some engineering and applied technical fields. [1]
The amount of energy equal to exactly 4.184 J and 1 kJ ≈ 0.239 kcal. [18] [19] [20] [11] [a] 4 °C calorie: cal 4: ≈ 4.204 J ≈ 0.003 985 BTU ≈ 1.168 × 10 −6 kW⋅h ≈ 2.624 × 10 19 eV The amount of energy required to warm one gram of air-free water from 3.5 to 4.5 °C at standard atmospheric pressure. [b] 15 °C calorie: cal 15
1 cal / °C⋅g = 1 Cal / °C⋅kg = 1 kcal / °C⋅kg = 4184 J / kg⋅K [20] = 4.184 kJ / kg⋅K . Note that while cal is 1 ⁄ 1000 of a Cal or kcal, it is also per gram instead of kilo gram : ergo, in either unit, the specific heat capacity of water is approximately 1.
The contribution of the muscle to the specific heat of the body is approximately 47%, and the contribution of the fat and skin is approximately 24%. The specific heat of tissues range from ~0.7 kJ · kg−1 · °C−1 for tooth (enamel) to 4.2 kJ · kg−1 · °C−1 for eye (sclera). [13]
The Boltzmann constant (k B or k) is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic temperature of the gas. [2] It occurs in the definitions of the kelvin (K) and the gas constant , in Planck's law of black-body radiation and Boltzmann's entropy formula , and is used in ...
[6] [7] By convention, 1 MET is considered equivalent to the consumption of 3.5 ml O 2 ·kg −1 ·min −1 (or 3.5 ml of oxygen per kilogram of body mass per minute) and is roughly equivalent to the expenditure of 1 kcal per kilogram of body weight per hour. This value was first experimentally derived from the resting oxygen consumption of a ...