467j

Created by: gewgrqger
Created on: 06-03-17 16:22

The temperature of the liquid in the container decreases as the liquid evaporates. why?

particles with most energy leave the (surface of the) liquid so the mean / average energy of the remaining particles goes down and the lower the average energy (of the particles) the lower the temperature (of the liquid)

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Describe the movement of the particles of helium gas inside the balloon

range of speeds moving in different directions /random motion

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What is meant by ‘specific latent heat of vaporisation’?

amount of energy required to change the state of a substance from liquid to gas (vapour)

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If the electrician touches the live wire he will receive an electric shock. Explain why?

(because the) potential of the live wire is 230 V (and the) potential of the electrician is 0 V (so there is a) large potential difference between live wire and electrician charge / current passes through his body

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Explain what being more energy efficient means?

A smaller proportion / percentage of the energy supplied is wasted

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