A platinum resistance thermometer has resistances of 160.0 when placed in a 0°C ice bath and 243.8 when immersed in a crucible containing a melting substance. What is the melting point of this substance? (Hint: First determine the resistance of the platinum resistance thermometer at room temperature, 20°C.)

the melting point T = 125.36°C

Explanation:

Given that:

The resistance of a platinum thermometer at  0°C is   = 160.0 ohms

The resistance of a platinum thermometer when immersed in a crucible containing a melting substance = 243.8 ohms

The temperature coefficient at room temperature  20°C = ∝ = 0.00392

The objective is to determine the melting point of this substance

To do that ; at 20°C, the resistance of the platinum thermometer can be calculated as follows:

The resistance of the platinum thermometer at t°C , =

105.36°C = (T - 20) °C

T = 105.36°C + 20 °C

T = 125.36°C

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explanation:

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