A unit of water is 100 cubic feet or 748 gallons.Water meters typicaly read in cubic feet. One cubic foot of water is equel to 7.48 gallons.
1 cc water weighs 1 gm, any other unit volume will be a multiple or fraction of that.
depends on the dimensions of the pan
A millilitre.
The liter.
A newton.
gram is the unit of water equivalent
Tepid
It depends on which unit of measurement you are using.
Unit of dm water conductivity is microsiemens/cm
That would depend on friction losses and fixture unit demands
If units are being installed in a series installation the you would always cold water going into the largest unit first. Water from the smaller unit would be used whenever you cust on the hot water and then warm water from the larger unit would transfer over into the smaller unit... This gives you a lot less recovery time.
Unit cost is how much is costs to make. Unit price is how much you sell it for. The difference is profit.