What is heavier? Stone or water?

[austinpetemo]

What's heavier by volume, THR or water? I want to rock out my 58 but I don't want to make the tank too heavy cuz it's on the second floor in our OLD house. Will adding rock increase the weight alot, or will it only weigh a little more than the water it displaces?

 

[verbal]

Limestone is about 150 lbs/cubic ft.

http://wiki.answers.com/Q/What_is_the_density_of_Limestone

Water is about 60(7.5 gallons/cubic ft * 8 lbs/gal). So each "gallon" of rock is 20 lbs.

So adds about 12 lbs of weight vs water.

 

[verbal]

Lava rock, probably has a lower density and greater area for the extra weight.

 

[geekboy]

I was going to chime in that "if it sinks, it's heavier than water by volume", but it seems you've already got that much figured out.

I totally and honestly asked a co-worker whether a bucket of sand weighed more than a bucket of water once. I never lived it down.

 

[jpappy789]

A 5 gallon bucket full of THR is a hell of a lot haevier than a 5 gallon bucket of water :laugh:

 

[efors]

Dam Archimedes Principle!!!

 

[Pittbull]

LOL

 

[efors]

What's heavier by volume, THR or water? Will adding rock increase the weight alot, or will it only weigh a little more than the water it displaces?

About the first question: as it was said, if the rock sinks, it is denser or heavier than water by volume. Elementary Physics, my young friend! But then you can ask: Which is heavier, 5 pounds of water or 5 pounds of THR?:irked:...Don't answer it, please!
About the 2nd question: "Any object displaces an amount of water equivalent to its own weight." That's what Old Archimedes said in his famous principle. I hate to remember it! Again, Basic Physics, Austin! Do not get angry with me, OK?

 

[verbal]

About the first question: as it was said, if the rock sinks, it is denser or heavier than water by volume. Elementary Physics, my young friend! But then you can ask: Which is heavier, 5 pounds of water or 5 pounds of THR?:irked:...Don't answer it, please!
About the 2nd question: "Any object displaces an amount of water equivalent to its own weight." That's what Old Archimedes said in his famous principle. I hate to remember it! Again, Basic Physics, Austin! Do not get angry with me, OK?

The Archimedes principal is volume not weight.

 

[efors]

Verbal, that principle is related with both: weight and volume. What it means is that if you measure the weight of the volume of water displaced by an object, it is equal to the object's own weight. Enough about Archimedes, please!