What Is The Specific Heat Capacity Of Graphene?
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What is the specific heat capacity of graphene, not graphite?
If you see two materials, one which absorbs heat faster than the other, then it is because of Heat Capacity. So different materials when supplied by the same amount of heat would increase in Temperatures by different magnitudes. This is because of Heat Capacity. Heat capacity is the amount of heat that has to be supplied to a given mass of a material in order to produce a unit change in itâs temperature. If you are looking at the Kelvin scale, then the amount of heat that has to be added in order to raise the Temperature by one Kelvin is the heat capacity. Its unit is very simple - Heat / Temperature - J / K. If a large body is considered. it requires more heat to be supplied to raise the Temperature by one unit. Thus, heat capacity is an EXTENSIVE PROPERTY. The corresponding Intensive property is the Specific Heat Capacity. The specific heat capacity divides the heat capacity by the mass. Since being mass specific, Specific heat capacity removes the effect of mass and hence is an Intensive property. Heat capacity C = dQ / dT or simply dQ (for unit temperature change). dQ is the amount of heat that has to be added to raise the Temperature by dT. Heat capacity at constant pressure is Cp and heat capacity at constant volume is Cv. If a substance has more heat capacity, then it means that it requires more heat energy to raise the temperature by one unit. Heat capacity is different from specific heat capacity. Specific heat capacity is the amount of heat added to raise the temperature by one unit of exactly one gram of the material. Example - If you are designing a material which should not change in Temperature, then you should choose a material with high heat capacity.
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It reduces the amount of work, and hence the time it takes to produce a unit of temperature change. This is the reason for selecting highly thermal conductive materials and plastics, because these materials require little or no heat energy to provide the change in temperature. In fact a great amount of heat energy is used to change the temperature of a plastic. The heat energy can be absorbed or extracted. If the material is high in heat capacity, heat energy is saved by not having to produce the required amount of heat energy. Example — A material with high specific heat capacity, will absorb more heat energy when it is heated. The temperature rise can be reduced, and the overall time it takes to heat up will be less. Example — Thermal conductive fibers absorb heat energy and transfer this to the surrounding material. Their temperature coefficient indicates.
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