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Introductory Physics Homework Help
Do you need to account for the water heating up to the boiling point?
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[QUOTE="curly_ebhc, post: 6834660, member: 36872"] High School Physics Lab: Take 200mL of water (Room temp) and place it in a microwave on high for 60 seconds. Calculate the Energy transferred to the water by the microwave. Pretty easy: Step 1: Heat of Temp Change : Q= mC∆T where m=200mL Step 2: Add Heat due to phase change: Q=mL where m= mass lost QUESTION: The question is do you need to account for the water heating up to the boiling point? The physics department has two opinions on this. Opinion 1: The water must heat up to 100 ℃ before it can undergo phase change. Therefore Step 2 should include a mC∆T + mL to account for the temperature change for the mass of water lost. Opinion 2: Due to the fact that temperature describes a distribution of kinetic energies, the particles that have enough energy to vaporize already have their heat energy added in Step 1. Disclaimer: We are a bunch of high school physics teachers who once earned degrees that forced us to understand this stuff, but that was many eons ago. Also as far as the actual values in the lab go, the difference between opinion 1 and opinion 2 are negligible. [/QUOTE]
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Introductory Physics Homework Help
Do you need to account for the water heating up to the boiling point?
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