熱ねつエネルギー

ね

つ

エ

ネ

ル

ギ

ー

Meanings

1

noun

thermal energy; heat energy

Scientific and everyday term for energy in the form of heat.

熱ねつ
熱 is the general word for heat or fever, while 熱エネルギー specifically refers to heat as a form of energy.
エネルギー
エネルギー is a broad term for energy in general; 熱エネルギー narrows it to thermal energy.

Compound of 熱 (netsu, 'heat') and エネルギー (enerugī, 'energy'), a direct calque of English 'thermal energy'.