Vapor pressure is a criteria for a substance's volatility. This is the ability of a substance to transition from liquid to vapor. When the vapor pressure equals the external pressure, liquid turns to gas. Hence, if the substance has higher vapor pressure, then it is volatile. <em>Therefore, Sample A is more volatile than Sample B.</em>
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They will eventually reach equilibrium. But, before that, the thermal energy particles of the COLD milk will slow down the hot cocoa.
The heated gas particles are moving around more and have more energy so they hit the walls of the container more often and with more force.
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