Radiation

Our final lesson on heat loss was to do with radiation. Radiation is the name for heat travelling as heat rays. No particles are needed for this to happen, so radiation can happen in a solid, a liquid or a gas. It can even happen in space, where there are no particles at all. This is how heats gets to the Earth from the sun.

We investigated whether silver or black surfaces give out heat by radiation quicker. We measured the temperature of hot water in the beakers every 5 minutes for 20 minutes to find out how quickly they gave out heat.

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Every group found that the black flask lost its heat quicker than the silver flask. This means that the black flask radiates heat faster than the silver flask.

Radiation

Today 1G3 were learning about radiation. we did an experiment where we got 2 metal beakers 1 of them was black the other was silver and filled them with boiling water, then we put the thermometer into the water we waited until the thermometer stopped moving and timed until it went cold.

Heat topic – class materials

A version of the teaching and learning materials for the heat part of the topic is available here. This goes into extra detail about designing fair experiments, how particle theory helps to explain how heat travels in solids liquids and gases practical applications of conduction, convection and radiation and how homes are insulated.

Ask about any of the topics in class.

Big file alert – this is a big file and might take a while to load. Not sure how it will cope with being on a phone – somebody let me know.

heat

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