- #1

A temp change of 20 degrees C corresponds to a temp change of

68degrees F

i got this one wrong? what's up with that???

68degrees F

i got this one wrong? what's up with that???

Last edited by a moderator:

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- Thread starter Dx
- Start date

- #1

68degrees F

i got this one wrong? what's up with that???

Last edited by a moderator:

- #2

dav2008

Gold Member

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20 deg C=68 deg F...but...

Lets say the change in C is from 0 to 20, then the change in F is from 32 to 68, giving your answer of (68-32)=36

- #3

HallsofIvy

Science Advisor

Homework Helper

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Water boils at 212 degrees F= 100 degrees C

so that 212-32= 190 degrees F spans as much as 100 degrees C so each degree C corresponds to 190/100= 1.9 degrees F.

A change of 20 degrees C corresponds to a change of 20(1.9)= 38 degrees F.

(Or, you could have argued that 20 degrees C is 1/5 of the way from freezing to boiling and so corresponds to (212-32)/5= 190/5= 38 degrees F.

(Oh, by the way, a temperature of 20 degrees C is 70 degrees F, not 68. The general formula is F= 1.9C+ 32.

- #4

Originally posted by HallsofIvy

Water boils at 212 degrees F= 100 degrees C

so that 212-32= 190 degrees F spans as much as 100 degrees C so each degree C corresponds to 190/100= 1.9 degrees F.

A change of 20 degrees C corresponds to a change of 20(1.9)= 38 degrees F.

(Or, you could have argued that 20 degrees C is 1/5 of the way from freezing to boiling and so corresponds to (212-32)/5= 190/5= 38 degrees F.

(Oh, by the way, a temperature of 20 degrees C is 70 degrees F, not 68. The general formula is F= 1.9C+ 32.

Thanks for the info Ivy and dav2008.

BTW...9/5 = 1.8C + 32 not 1.9 and my answer of 68 degrees is right.

Thanks!

Dx

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