Heat capacity equation units

Rizwan Yaseen

How we change the units of Heat capacity equation to British engineering system
Cp=2. 657*10^4 +42. 37T - 1. 425*10^-2T^2

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BvU

Homework Helper
Hello Rizwan, You don't mention any units in your expression. Can I guess it's for ice at 0 C and expressed in J per kmol per Kelvin ?

I don't think the British units system managed to mess up the kmol too, so all you have to do is convert Joules to British dingdongs, so e.g.
if 1 Joule is 0.000947817 BTU,
and 1 K is 9/5 F (+ some constant) multiply by 0.000947817 and divide by 9/5. That's all.

But if you want to mangle it further, you still have to divide by the molar weight to get $\approx$ 0.5 BTU/lbm/F

PS why do I have to google that for you? You can find such conversions all over the place !

• Rizwan Yaseen

Rizwan Yaseen

Hello Rizwan, You don't mention any units in your expression. Can I guess it's for ice at 0 C and expressed in J per kmol per Kelvin ?

I don't think the British units system managed to mess up the kmol too, so all you have to do is convert Joules to British dingdongs, so e.g.
if 1 Joule is 0.000947817 BTU,
and 1 K is 9/5 F (+ some constant) multiply by 0.000947817 and divide by 9/5. That's all.

But if you want to mangle it further, you still have to divide by the molar weight to get $\approx$ 0.5 BTU/lbm/F

PS why do I have to google that for you? You can find such conversions all over the place !

Rizwan Yaseen

Yes units are J/kgmol/Δ K and T in °K and convert them to BTU/kgmol/ΔF and expressT In °F (degree F)

maistral

I know this might probably be too late, but you can always use dimensional analysis. Then constants would then begin to appear and you can distribute them afterwards.

• Rizwan Yaseen

Chestermiller

Mentor
Yes units are J/kgmol/Δ K and T in °K and convert them to BTU/kgmol/ΔF and expressT In °F (degree F)
Are you sure you don't mean lb-moles?

Rizwan Yaseen

Oops sorry sir but it's lb moles I write in a hurry but still this conversion confuse Me How I might get this one.

Chestermiller

Mentor
1 Joule = ? BTU

1 kg = ? lb

1 kg-mole = ? lb-moles

1 degree centigrade = ?? degrees F

Fill in the ??s

"Heat capacity equation units"

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