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The British thermal unit (Btu) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit .
Calorimetry is measurement of quantity of energy transferred as heat by its effect on the states of interacting bodies, for example, by the amount of ice melted or by change in temperature of a body. [3] In the International System of Units (SI), the unit of measurement for heat, as a form of energy, is the joule (J).
The SI unit for heat capacity of an object is joule per kelvin (J/K or J⋅K −1). Since an increment of temperature of one degree Celsius is the same as an increment of one kelvin, that is the same unit as J/°C. The heat capacity of an object is an amount of energy divided by a temperature change, which has the dimension L 2 ⋅M⋅T −2 ...
It is also referred to as Massic heat capacity or as the Specific heat. More formally it is the heat capacity of a sample of the substance divided by the mass of the sample. [1] The SI unit of specific heat capacity is joule per kelvin per kilogram, J⋅kg −1 ⋅K −1. [2]
It is typically used in industrial plants for measuring boiler output and heat taken by process, and for district heating systems to measure the heat delivered to consumers. [1] It can be used to measure the heat output of say a heating boiler, or the cooling output from a chiller unit.
In the sun, in the shade, on a rock, in a glade. For every different way there is to experience heat — in the sun, in the shade, on a rock, in a glade — there is a scientific debate about how ...
Heat capacity of a material per unit amount of substance J/(K⋅mol) L 2 M T −2 Θ −1 N −1: intensive Moment of inertia: I: Inertia of an object with respect to angular acceleration kg⋅m 2: L 2 M: extensive, tensor, scalar Optical power: P: Measure of the effective curvature of a lens or curved mirror; inverse of focal length: dioptre ...
A unit of electrical energy, particularly for utility bills, is the kilowatt-hour (kWh); [3] one kilowatt-hour is equivalent to 3.6 megajoules. Electricity usage is often given in units of kilowatt-hours per year or other periods. [4] This is a measurement of average power consumption, meaning the average rate at which energy is transferred ...