OccasionalDucksCan anyone tell me why this government advice says to use fans to keep cool “if the air temperature is below 35°C”? Why not use them at 35° and above?
Robyn@OccasionalDucks
"Heat cannot of itself pass from one body to a hotter body (and that's a physical law)"
If you blow air that is cooler than your body past it, the heat from your skin warms the air and the now warm air takes it away.
If air is hotter than your body your skin cools the air by absorbing heat from it. So constantly replacing it with fresh hot air makes you hotter faster
"Heat cannot of itself pass from one body to a hotter body (and that's a physical law)"
If you blow air that is cooler than your body past it, the heat from your skin warms the air and the now warm air takes it away.
If air is hotter than your body your skin cools the air by absorbing heat from it. So constantly replacing it with fresh hot air makes you hotter faster
Ah. That makes sense. So no I know, thank you :-)
@OccasionalDucks
That is a simplified version, so your government's advice may be oversimplified. Things are complicated particularly by humidity. Moist heat is way more dangerous than dry. If it's too humid for sweat to evaporate you are in much more trouble.
That is a simplified version, so your government's advice may be oversimplified. Things are complicated particularly by humidity. Moist heat is way more dangerous than dry. If it's too humid for sweat to evaporate you are in much more trouble.