radiant heat

American  

noun

Thermodynamics.

1. heat energy transmitted by electromagnetic waves in contrast to heat transmitted by conduction or convection.

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radiant heat British  

noun

1. heat transferred in the form of electromagnetic radiation rather than by conduction or convection; infrared radiation

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Etymology

Origin of radiant heat

First recorded in 1500–10

Example Sentences

And there’s “scorch,” at the low end, when radiant heat, not flame, kills the crown but leaves dead foliage in place.

From Los Angeles Times • Mar. 13, 2026

Keep in mind that the placement of insulation is vital to ensure all the heat produced by electric coils or radiant heat tubing is directed into the living space.

From Seattle Times • Jan. 25, 2024

Like any hot object, it was giving off radiant heat -- what we’d now call long-wave infrared radiation.

From Scientific American • Nov. 9, 2023

The researchers investigated the complex interplay between the transfer of radiant heat and the thermochemical reaction.

From Science Daily • Oct. 27, 2023

These experiments prove, in the most conclusive manner, that dry pure air is almost a perfect non-absorbent of radiant heat.

From Lectures on Ventilation Being a Course Delivered in the Franklin Institute of Philadelphia by Leeds, Lewis W.