Energy
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When drawing energy system diagrams how do we know how many circles i draw in the system?
I have to draw an energy system diagram for tea and ice the tea starts at 20 degrees celsius and the ice starts at -65 degrees celsius and they are reaching thermal equilibrium...how do i know how much energy systems should be drawn in the closed energy system?? Please explain in detail if you can. Thanks!
The "circles" represent system boundaries.
The size and number of systems depend on what variables you have been given and what you need to find out.
The word equlibrium means that you need to pay attention to both the ice and the tea, so i would draw my system boundary around the tea glass.
If they gave you the temperature of the room and told you to give them the equilibrium temperature of the tea and ice, you would still just draw the system boundary around the tea glass. You would simply define the air as being a Q in.
If they ask for the temperature of the equibrium temperature of the room, tea, and ice then you have to include the room in your system.
It takes practice. (i focused on the engineering use of boundaries; highschool teachers often don't know what is going on and are just using it as busy work. If thats the case, you better learn it from them and consider it a non-practical memorizing game)
Cheers!
