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Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

1. Temperature vs Time (linear increase)
2. Temperature vs Time (exponential increase)
3. Temperature vs Time (logarithmic increase)
4. Temperature vs Time (constant)

Correct answer: Temperature vs Time (linear increase)

Solution

At constant pressure, the temperature of a substance increases linearly with time if the rate of heating is constant, as the heat supplied is directly proportional to the temperature change (Q = mcΔT).

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