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.
太陽の放射熱で地球は暖められる。
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.
輻射熱を利用した暖房器具。
A heating appliance that uses radiant heat.
The warmth felt directly from a heating device like a kerosene heater, electric heater, or wood stove.
Common way to refer to the heat coming from a stove or heater. 'ストーブ' covers various types of heaters.
ストーブの熱で部屋がぽかぽかだ。
The room is toasty warm from the heater's heat.
General term for heat from a heating system. Can include radiant or convective heat.
暖房の熱が直接当たる場所に座ると暖かい。
It's warm if you sit where the heat from the heater hits you directly.
The warmth felt directly from sunlight, especially on the skin.
Refers to the heat from the sun's rays. '日差し' means sunlight or sunshine.
日差しの熱で車の中が暑くなった。
The inside of the car got hot from the sun's radiant heat.
Direct translation of 'sun's heat'. More general, can include overall heat from the sun.
太陽の熱が肌にじりじりと感じられる。
I can feel the sun's heat burning on my skin.
The intense heat felt when sitting near a campfire, fireplace, or charcoal grill.
General term for heat from a fire. Can be used for campfires, fireplaces, etc.
火の熱で顔が熱くなった。
My face got hot from the fire's heat.
Specifically the heat from a bonfire or campfire.
焚き火の熱でマシュマロが溶けた。
The marshmallow melted from the campfire's radiant heat.
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.
このヒーターは放射熱で部屋を暖めます。
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).
ストーブの前に座ると、熱が直接当たって暖かい。
When you sit in front of the heater, the heat hits you directly and it's warm.