This morning I walked into the library cafe and got my daily morning coffee. As I sat down, I slipped and the coffee spilled onto the table. I left the coffee there for a while, and then cleaned it up after. I started to ask myself how much heat energy was transferred from the coffee to the table for the coffee to lose so much heat.
The Coffee was approximately 71.5 C when I got it, and then fell to a room temperature of 23 C.
The mass of the Coffee Spilled was .10kg, and the specific heat for coffee and milk is 4.184 J/ (g C˚).
Using the equation :
We can find that the transfer of heat energy is...
Q= (.10kg)( 4.184 J/ (g C˚))(48.5 C)
Q=20.3 J of energy is lost from the coffee to it's environment.