You can get up to extreme temperatures in a hot tub by slowly turning up the temperature and it will feel like a normal hot tub near dangerous temperatures
Your body’s reaction to being too warm is to sweat. The sweat will evaporate, cooling your body down as it does so. This works well in air. However, in water, the sweat doesn’t do anything; it just mixes with the water, providing no cooling.
You might not even realize you’re sweating in a hot tub (especially if you’re splashing around), since your body does it automatically. However, you’ll definitely notice the sweat when you’re in air; it’ll bead up everywhere, and start dripping if it’s both hot and humid. Thus, you’ll realize you’re too hot much more quickly in air than in water.
Alicia-XTC t1_j6kvrv0 wrote
I don't know about you, but it might take a minute to realize a building is warm when I walk in, but instantly know when the shower is scalding hot.