what wieghs more water or sand?

Question

1 gallon of water weighs 8.333 pounds how much would a gallon of sand weigh?

Answer 1

You have the right idea (essentially), to compare the densities of the two materials in order to find which one "Weigh" more (is more dense).

Density = mass / volume
weight = mass * gravity
Thus, the denser material will weigh more if you have an equal volume of both.

You say that was has a density of about 8.333 pounds per gallon. I prefer to state this as 1 g/mL.
This value can pretty easily be obtained by taking a gallon bucket and filling it with water, than measuring its mass (and subtracting out the mass of the bucket).
But if you try to do the same thing with sand, you will get the wrong answer. It may not seem like it to you, but if you fill the bucket up with sand, there are lots of tiny air pockets which are incorrectly counted towards the volume of sand. You need the bucket to be completely filled with sand (just as the bucket is totally filled with water...not tiny air pockets).

Sand is basically just Silicon Dioxide (SiO2). The density of SiO2 is about 2.6 g/mL.
So the density of sand is greater than that of water. Thus, for equal volumes of sand and water, the sane will weigh more.

But there is another, more qualitative, method to use if you were merely interested in which one was denser rather than actual numerical values.
When you put sand in water, does it float of sink? Sometimes it might take a while to settle, but sand will sink to the bottom of the container filled with water, this tells you that the sand is denser than water.

Answer 2

The density of sand depends on whether it is wet or dry, packed or loose, ranging from a low of about 1400 kg/cubic meter to greater than 2000 kg/cubic meter--but in all cases its density is greater than water.

Pure water's density depends on its temperature (and to a much lesser extent, pressure). For example at 25 degrees C, its density is 998 kg/cubic meter.

(You could figure out the exact density of the water in your problem--and hence its temperature--but I suspect that's not the point of the problem.

So let's assume the density of your water is 1000 kg/cubic meter. And let's pick wet packed sand at about 2000 kg/cubic meter (its really about 2080 kg--but it depends on who's packing, right?).

Then an equal volume of sand would weigh about twice as much as the water.

Though your problem has four significant figures for the water weight, it has only one for the volume, so that's probably the best you can do, especially since the state of the sand isn't specified.

Answer 3

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