How many methods of heat transfer are there

Three types

The three types of heat transfer

Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation). Heat is usually transferred in a combination of these three types and seldomly occurs on its own. Hope I helped!! <3

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3種類

3種類の熱伝達

熱は、固体材料（伝導）、液体と気体（対流）、および電磁波（放射）を介して伝達されます。熱は通常、これら3つのタイプの組み合わせで伝達され、それ自体で発生することはめったにありません。私が助けてくれたらいいのに！< 3

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.