Define Thermal conductivity. What is the SI unit of Thermal resistance? [2 + 1]
OR
Define volume expansion coefficient of a gas. Find its value from Charles’s law. [1 + 2]
Thermal Conductivity is the ability of a material to conduct heat. It indicates how easily heat passes through a substance.
The SI unit of Thermal Resistance is kelvin per watt (K/W). It measures how much a material resists the flow of heat.
OR
Volume expansion coefficient: The coefficient of volume expansion of a gas at constant pressure is defined as the fraction of its volume at 0°C by which the volume of a fixed mass of gas expands per degree Celsius rise in temperature.
According to Charles’ law, the volume of a given mass of gas at constant pressure expands or contracts by a fixed fraction 1/273 of its volume at 0°C for each degree Celsius rise or fall in temperature.
we get γₚ = 1 \over 273 °C-1
= 0.00366°C-1
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