# physics

Pls help me with this, The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?

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1. Temperature is a linear function of absolute temperature

Resistance=Ro(1+constant*To)

40=30(1+constant(10))
solve for constant,

then
R=30(1+constant*deltaT)
solve for deltaT, add that to 30C

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