[freeboy]

1) Calculate the heat (Btu) required to heat a gallon, say 10 lb of water from ice at 10F to steam at 212F


Do you have idea.
2)Plot the temperature gradient inside a 2x6 wall with a temperature difference from 70F inside to --30F outside

[Perito]

1. a. Look up the specific heat of ice, the amount of heat required to heat a given mass of ice by one degree. Multiply that by the mass and by the number of degrees you're heating (32-10 = 22 degrees).

b. Look up the specific heat of water. Do the same thing that you did in a -- but from 32 to 212 degrees.

c. Look up the heat of fusion of water. This heat is required to melt ice to water (the temperature doesn't change during this process). Multiply that by the mass of water.

d. Look up the heat of vaporization of water. This heat is required to turn water (at 212 F) to steam (at 212 F). Do the same as in c.

e. Add all of the values together.

f. If any of the values, above, are not in the proper units, convert the value you found to the proper units by multiplying (or dividing) by appropriate constants.

2. This is easy. It's linear if you assume the wall is uniform (it's not really). You can figure that out very easily.

[Perito]

Thanks for the "reddie". Don't be too lazy to try. If you don't learn, you can't claim that you did.