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I’d like to check for nitrate levels using online optic system. Nitrates (NO3-) in liquid absorb mostly around 220nm , most water quality devices looking for nitrate check around there. I found a ~20$ diode that detects down to 215nm. I can compare the diode signal thru ‘bad’ water with...

Ok I blv the solution is that even though I have two equations of the form f1(Two)=f2(Two,Twi) f2(Two,Twi)=f3(Twi) and therefore f1(Two)=f3(Twi) that doesnt mean that I have only one independent equation . I can still solve f1=f2 for Two in terms of Twi, plug that into f2=f3 and solve for Twi in...

If there is in fact only one independent equation and two variables, wouldn't this mean there are infinite possible solutions?

I've got a simple problem that I'm not able to crack - A wall of a building has one side in the sun, the other side in an airconditioned area of the building. The ambient temperature To is known as is the temperature inside the airconditioned area Ti. I would like to find the equilibrium...