Interestingly, I am often asked how much a gallon of water weighs. I’ve heard guesses from 5 to 15 pounds. How
much does a gallon of water actually weigh?The simple answer is that a gallon of water weighs about 8.3 pounds.
But this answer comes with a warning.
Someone who tries to be smart with you (or just takes the question literally) can tell you that it is a tricky question
that has no answer in the way it was done.They can also simply ask for the water temperature. The point is that
assuming we are talking about liquid water, the weight per gallon, called density, of waterwill fluctuate with temperature.
Why does the density of water fluctuate with temperature?Temperature is a way of measuring quantity if energy has something.
Higher temperature correlates with higher
energy. In the case of water, a higher energy willcause the water molecules to vibrate. When they vibrate they push
their neighbors to the side. Basically, every molecule wants a little more personal space. Now, imaginethat you have
a gym and draw a square on the floor that fills half the gym. This square will represent a gallon. You pack a hundred
people in the square. I mean, you reallypack them like a meter at rush hour. Then you pump some energy into the
room. You have people moving. Now each person needs a little space and, what happens? Somepeople are pushed
out of the square. You used to have 100 per square, but now you have maybe 75 people in the square. That is, the
density in the square decreased as theenergy increased. That is exactly what happens when the water temperature
rises. Since a gallon is an arbitrarily established amount of space, the amount of molecules in that space will
fluctuate. that is why at 50 degrees Fahrenheit the density of water is8.3430 lb / gal and at 200 degrees Fahrenheit
the density of water is 8.0351 lb / gal.I hope this helps clear up any doubt if exists that how much does a gallon of water weigh!
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