"Mike" wrote in message
...
Can someone please tell me what the volume of water is, in gallons,
of a 50
metre length of garden hose.

The diameter is probably about 2 cm.
The cross sectional area is then 3.142 square cm
The volume will be 15710 cc, or 15.7 litres
At approximately 4.5 litres per gallon, this comes to about 3.5
gallons.


Thinking of making a heat exchanger to heat up the water in a big
box with
50 metres of garden hose snaked out and under a Perspex cover

There has to be a calculation somewhere bit I don't know.

Franz