Question

When you step into a very full bath or hot tub, sometimes the water overflows. But when you step into a lake and swim, you don't notice the level of the water rise at all. Explain why this is.

Answer 1

This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow