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Why newtons law of colling holds good only for small difference of temperature?
Wiki User
∙ 11y ago
- As energy istransferredfrom the heat source to the heat sink, the temperatures of the source and the sink change of course. Because heat capacity is not strictly a linear function of temperature, the proportionality "constant" is in fact not constant but rather also a function of temperature.
- Also, for large differences of temperature where the surroundings are some kind of fluid, significant convection occurs - which again will change the cooling rate in non- linear ways. For very small differences of temperature, the convection is not significant.
Wiki User
∙ 11y ago
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a
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