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The dimensional formula for thermal resistance is:
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Important Questions on Thermal Properties of Matter
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Ice starts forming in lake with water at and when the atmospheric temperature is . If the time taken to form thick ice be then, the time taken for the thickness of ice to change from to is,
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Two walls of thickness and and thermal conductivity and are in contact. In the steady state, if the temperatures at the outer surface are and , the temperature at the common wall is:
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The heat is flowing through a rod of length and area of cross-section . Its ends are at and respectively. The coefficient of thermal conductivity of the material of the rod is . The temperature gradient in the rod is
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If two metallic plates of equal thickness and thermal conductivities and are put together face to face, and a common plate is constructed, then the equivalent thermal conductivity of this plate will be
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The area of the glass of a window of a room is and thickness . The outer and inner temperature are and , respectively. Thermal conductivity of glass in MKS system is . The heat flowing in the room per second will be
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If the coefficient of thermal conductivity of aluminium is, then in order to conduct in the steady-state, the temperature gradient in aluminium must be
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Consider a compound slab consisting of two different materials having an equal thickness and thermal conductivities and , respectively. The equivalent thermal conductivity of the slab is
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The ratio of coefficients of thermal conductivities of two different materials is If the thermal resistance of rods, having same material and thickness, is the same then, what is ratio of lengths of these rods?
