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17 Cards in this Set
- Front
- Back
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? K = 0C |
273K = 0C |
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temperature definition |
property of a body that controls the direction of flow of heat, K, C |
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heat definition |
energy transferred to or from a body, Joules |
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heat flow definition |
flow of heat through area over time, W m^-2, often given symbol q |
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specific heat definition |
the amount of energy required to change the temperature of a substance. normally under constant pressure conditions, cp, occasionally under constant volume conditions, cv. With liquids and solids cp = approx. cv |
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specific heat formula |
E = mcΔT |
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latent heat definition |
energy per mass required to change the phase of a material at constant temperature (eg. gabbro to eclogite or graphite to diamond) |
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latent heat formula |
Q = Lm |
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coefficient of thermal expansion formulas |
α controls the change in volume produced by a change in temperature: ΔV = +αVΔT (+ means V increases if ΔT positive) α also controls the change density produced by a change in temperature: Δρ = -αρΔT (ρ decreases if ΔT positive) |
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formula for new density after change in temperature |
ρT = ρ0 (1 - α ΔT) (ρ0 is the initial density) |
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thermal conduction definition |
microscopic motions (because of density differences due to temperature) cause heat to diffuse through a material |
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advection definition |
moving material carries heat with it |
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thermal radiation definition |
electromagnetic waves transfer energy |
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Fourier's Law of thermal conduction (formula) |
q = -k ΔT/ x q = amount of heat conducted (W m ^-2) k = thermal conductivity x = distance heat has to travel minus shows heat flows from hot to cold |
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diffusion definition |
the spreading and egalising of something (T here) over time |
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thermal diffusivity formula (rate of diffusion) |
κ = k / (ρc) κ = thermal diffusivity k = thermal conductivity κ = approx 10^-6 for most rocks |
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'time it takes to diffuse' formula |
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