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Which is heavier - an equal volume of water or gasoline?

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Weight of Water Compared to Weight of GasolineAt a temperature of 20 oC or 68 oF, a (U.S.) gallon of pure water weighs about 8.34 pounds, whereas a gallon of vehicular gasoline weighs about 6.15 pounds at that temperature.  
Diesel weighs about 7.1 pounds per gallon.
Though the question is appears to be about weight, it is actually about density, which is weight per unit volume.
The SI-Unit of density is the kilogram per cubic metre, and expressed in those units, the densities are these:
Water: 998 kg/m3
Gasoline: 720 kg/m3
Diesel: 830 kg/m3
You see this when gasoline and water are put into a glass: because they are immiscible and the density of gasoline is lower, it will stay at the top. (Be careful when doing this as gasoline vapor is explosive and toxic!)
In the bathyscaphe Trieste, a research submarine designed to go to the deepest point of the Pacific Ocean, the bathyscaphe was filled with gasoline, which was buoyant in the ocean water. It carried steel shot as ballast to make it sink, and the gasoline provided the "lift", similar to a balloon in the air.
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What is heavier gasoline or water?

Water is "heavier" as the density of water is greater than the density of gasoline thus gasoline will float on water.

Why mass of water is equal to its volume?

First: all units of measurement such as meters, seconds, liters, kilo-grams, etc. were invented to be comfortable for daily use. When scientist had to agree on how to measur

What is 5c x 100 equals?

(5c) x (100) = 500c

What makes gasoline heavier than water?

Water is heavier than Gasoline. Water weighs 8.34 pounds per gallon, Gasoline weighs 6.15 pounds per gallon.  Water is denser than gasoline.  Gasoline floats on water.

What is -5c in Fahrenheit?

23F

One gram of water equals what volume?

The mass and volume of water was used to define the SI units for weight and volume, and is almost exactly 1 gram per milliliter (1 gram/cm3). Although this changes slightly wi

What is the answer to 20c plus 5 equals 5c plus 65?

20c + 5 = 5c + 65 Divide through by 5: 4c + 1 = c + 13 Subtract c from both sides: 3c + 1 = 13 Subtract 1 from both sides: 3c = 12 Divide both sides by 3: c = 4