Although John Hopkins the individual born, May 19, 1795 and died December 24, 1873, did not himself have a Birth Tub; He did leave enough money to found Universities and Hospitals that carry his name. The John Hopkins birthing Centre's have birthing tubs.
For more information on the Centre's check the related link source below
Some birthing centers use a hot tub for labor and delivery. It is called a water birth. A hot tub in itself can not make you go into labor, it can alleviate the pains of labor if done correctly in a controlled environment like a birthing center.
Empty the water out and scrub the tub clean.
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Your mass, the mass of the tub and the specific gravity of the water do not change, whether you are in the tub or not.
run hot water and soap in the tub and scrub
It will move from one tub to the other. What is it you want to know?
That depends on the volume/size of the tub in question. A "tub" could be a butter tub, a mash tub a bath-tub etc.
Because your body displaces some of the water and there is no place for it to go except higher in the tub.
Yes, but with NO water in - just to play in an empty tub.
The tub would eventually empty
The cup of water is as hot as the bath tub full of water as they are at the same temperature.
Water seeks its own level zand the tub and basin drain into the same waste line. The back flow into the tub means the drain has a partial stoppage down stream of the basin waste and the waste flows back into the tub as the tub waste is lower then the basins waste