system
Given the following post, respond as if you're commenting on Reddit:
human
How fast does heat radiate outward from its source?

Say I'm standing next to a fire. What is the speed of the heat energy being sent into my body and everything else around it? Or does heat travel at the speed of light but loses energy much more quickly?
gpt
Heat can travel in several ways!
One is radiation. Fire emits visible and invisible electromagnetic radiation, which travel outwards at the speed of light and heat up your body when they reach it. This is also how the sun’s energy reaches us. Another is by conduction. This is when the fire heats up the air around it, which in turn heats up the air around IT; the energy is transferred by air molecules bumping into each other. This is significantly slower than the speed of light, and unlike radiation, it requires a medium such as air, so we don’t get any of the sun’s energy this way.