Math and Arithmetic

Units of Measure

Weight and Mass

# How much does a gallon of salt water weight?

###### Wiki User

###### October 08, 2007 1:17PM

A GALLON OF SALT WATER WEIGHS 8.556 LBS. A CUBIC YARD OF SALT WATER WEIGHS 1728

LBS OTTO

## Related Questions

###### Asked in Units of Measure, Chemistry, Volume, Weight and Mass

### How much does one gallon of salt water weigh?

Weight of a Gallon of Salt
Water
See the web links below this answer for an automatic calculator
that will give you the density of water at whatever temperature and
salinity you want. Once you know the density, it is easy to figure
out how much a gallon weighs ( 1 m3 = 264.17 gallons, and 1 kg =
2.2046 lbs, and 1 gallon = 3.7854 liters)
Here are opinions and answers from FAQ Farmers:
This depends on the amount of salt dissolved in the water. Sea
water in the Atlantic might weigh differently than in the Pacific,
and the water in the Dead Sea is much heavier than you might find
down at the local beach.
To get an exact answer, you must know the percent composition
of the salt water, or the ratio of salt to water. Roughly, salt
water weighs 64 lbs/cu. ft., as opposed to fresh water, which is
about 62.2 lbs/cu. ft. There are 7.4805 gallons in a cubic foot. So
a gallon of salt water weighs 8.556 lbs.
"A pint's a pound, the world around." That's a common
expression. A pint is 16 fluid ounces and 16 fluid ounces of water
weighs approximately 16 dry ounces. Two pints to the quart, four
quarts to the gallon means eight pints to the gallon, so a gallon
weighs about eight pounds. But that only applies to FRESH water.
Salt water has a whole range, depending on how much salt is
dissolved in the water. So you'd have to add the weight of the
dissolved salt.
Ans 5 - An Imperial Gallon of salt water weighs approximately
10.2 pounds, depending on where it's from. -(seas and oceans vary
in density)

###### Asked in Math and Arithmetic, Physics, Chemistry, Rain and Flooding

### If you add salt to water does the weight of the water change?

The salt-water mixture will have the same weight as the sum of
the weights of the water and the salt. The water, itself, doesn't
gain weight in a strict sense, but the salt-water mixture will be
heavier than the plain water. Salt water is denser than fresh
water.
Yes, the weight of any salts dissolved in water will be additive
with the water.
weight of salt + weight of water = weight of salt and water in
solution

###### Asked in Units of Measure, Chemistry, Volume, Weight and Mass

### How much does 1 US Gallon of Salt Water Weigh?

The mass and weight of a gallon of salt water depend upon the
temperature
and the salt concentration in the salt water.
Assume that T = 60 F and C sub salt = 5 mass percent
d = ( 64.4 lbm / cu ft ) ( 1.0 cu ft / 7.4805 gal )
d = 8.61 lbm / gal
m = ( d ) ( V )
m = ( 8.61 lbm / gal ) ( 1.0 gal ) = 8.61 lbm
<---------------
One gallon of pure water at 60 F would have a mass of 8.34 lbm
.

###### Asked in Units of Measure, Cooking Measurements, Volume

### What do a teaspoon a fluid ounce and a pint have in common?

These are all types of liquid measurements. Liquid measurements
differ from solid measurements in that the density of the liquid is
not factored into the total volume, but is factored into the total
weight in which that liquid occupies. Ex: One gallon of water has a
specific density. However, a gallon of salt water weighs more than
the gallon of water because the salt water has a higher density
(i.e. more dense) than the gallon of salt water, although they have
the same volume (one gallon). In case you are interested, the
correlation of weight, density, and volume is given by the formula:
Density = weight / volume. More correctly, it should read: Density
= mass / volume, but the relationship between mass and weight is:
Weight = mass * gravity, where gravity is a constant: 9.8
kg*(m/s2)

###### Asked in Math and Arithmetic, Volume, Weight and Mass

### What does a gallon of water with 3 pounds of salt weigh How do you determine this new weight Water weighs 8.345 pounds per gallon and so with 3 pounds of salt dissolved should weigh?

Density = 8.345 lb/gallon (this is an odd density, because
density changes depending on temperature, and this number is
actually for 40°F water, but that's not relevant to this
question)
Density (d) = Mass (m) / Volume (V)
d = m/V
m = Vd
m = (1 gallon ) ( 8.345 lbs / gallon ) = 8.345 lbsThe water
(without the salt) weighs 8.345 lbs
If you add 3 lbs of salt, you are just adding 3 lbs of salt.
Just add 3 to the weight. This part is just to trip you up.
8.345 + 3 = 11.345 lbs
The water with the salt weighs 11.345 lbs.

###### Asked in Salt (Sodium Chloride)

### Why does it take more time to boil when there is salt in a pan?

It depends. Salt water, about 1 lb. salt per gallon, requires
about 10% more heat to raise it to the boiling point, which is only
2 degrees higher than water without salt in it. This necessarily
needs more time to absorb more heat. A pot of water with a
tablespoon of salt in it though does not need more than a fraction
of a second more than a pot with the same amount of fresh water in
it to boil. A pot of water without a lid will actually take much
longer to boil because any escaping water vapor from the uncovered
pot actually cools the water remaining in the pot. So, to make a
pot of water boil faster, cover it.
To get into the thermodynamics of it. By adding salt to the
water you are adding weight to the solution. 1 lb of salt added to
8.33 lbs {1 gallon} of water raises the weight of one gallon to
about 9.2 lbs or slightly more than 10% requiring the additional
heat to raise the temperature. (Salt has a slightly lower specific
heat than water). So lb for lb salt water needs less heat than
fresh water, but gallon for gallon it needs more.