Question

# On the top of the mountain, water boils at A.High temperature B.Same temperature C.High pressure D.Low temperature

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Hint: On the top of the mountain there is less pressure on the molecules.
According to Gay Loussac’s Law at constant volume, the pressure of a fixed amount of a gas varies directly with temperature.
$P\alpha T$

So, when pressure is low the temperature is also kept lowered for processes to take place. When the graph is plotted between pressure and temperature, each line is called Isochore.