Translation guide
Heat transferred through electromagnetic radiation, felt directly from a heat source without heating the air in between.
The physical phenomenon of heat radiated from a source, such as the sun, a fire, or a heater.
The standard technical term for radiant heat. Used in scientific and everyday contexts.
The Earth is warmed by the sun's radiant heat.
A more formal or technical synonym for radiant heat, often used in engineering or physics.
A heating appliance that uses radiant heat.
The warmth felt directly from a heating device like a kerosene heater, electric heater, or wood stove.
The warmth felt directly from sunlight, especially on the skin.
The intense heat felt when sitting near a campfire, fireplace, or charcoal grill.
Both mean 'radiant heat'. 放射熱 is more common in everyday language, while 輻射熱 is preferred in technical fields like engineering and physics. In most situations, 放射熱 is sufficient.
This heater warms the room with radiant heat.
Instead of using a noun, Japanese often describes the sensation of radiant heat with verbs like 当たる (to hit, to be exposed to) or adjectives like 暖かい/熱い. For example, 'I feel the radiant heat' can be expressed as '熱が当たって暖かい' (the heat hits me and it's warm).
When you sit in front of the heater, the heat hits you directly and it's warm.
It's warm if you sit where the heat from the heater hits you directly.