In Finland, people go to saunas (hot houses) as they believe it's a healthy way to relax. Stones are heated up inside a well ventilated (air can move in and out) room.
When the stones are ready after 2-3 hours reaching temperatures higher than 100C, water is poured on the stones.
Imagine what happens as soon as water touches the stones!
Explain what you think happens. (Remember steam can't be seen.)
How does this process help the occupants feel warm?
Why do people pour water on the stones instead of just warming the room up with a heater?
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