Calculating Displacement

[MermaidMel]

Is there a way of doing it?
i.e. Xkg displaces Xg

 

[fatheadminnow]

There is 1000 g, in 1 kg, if that is what you mean.

Can you elaborate on what you want to know about?

-FHM

 

[MermaidMel]

There is 1000 g, in 1 kg, if that is what you mean.

Can you elaborate on what you want to know about?

-FHM

I meant X kilograms or any other weight conversion would displace how many gallons of water
Example only, but say I have a 30 gallon tank and put in 7 kilograms of wood, how many gallons would I displace?

 

[fatheadminnow]

There is going to be no direct relation to that because different pieces/types of wood are going to have a different mass/density, which means the weight of the wood is not going to have a relation to how big the wood is.

In other words, EX. Say you have two pieces of wood, both weigh exactly 7 kilograms, but one piece is twice as large as the other, this mean that the larger piece of wood is going to displace more water than the other will.

What can do is. Tank a 10 gallon tank, mark lines on the tank for every gallon. Put exactly 10 gallons of water in and then put the piece of wood in, allowing the water to spill out of the tank. Then take the piece of wood back out, and see where the water level is at, by looking at which line it is by.

Based on this, you will be able to figure out how much water a certain piece of wood will displace.

Hope this helps?

-FHM

 

[MermaidMel]

Ah well it was only an example so I don't really need to work it out in that way lol

I had a 55 gallon tank with 3 huge pieces of slate in it, massive, over a foot long and thick too

Just was curious how many gallons it lost me in volume when I was using them

 

[fatheadminnow]

Yeah, the only way to figure that out is to do the test that I described.

As displacement has no direct relation with mass, only volume of another object.

-FHM

 

[P&J]

Ah well it was only an example so I don't really need to work it out in that way lol

I had a 55 gallon tank with 3 huge pieces of slate in it, massive, over a foot long and thick too

Just was curious how many gallons it lost me in volume when I was using them

Well, slate should be easier than wood, as it is roughly rectangular, right? If you know length, width, and height, you can get a rough estimate by plugging it into the aquarium calculator on this site. Obviously, if it's not perfectly square, you're only going to get a rough estimate, but perhaps that's better than nothing. Also keep in mind that your substrate is taking up space/gallons too.

-P

 

[CKutz]

hahaha FHM, i saw this and thought i'd be able to help

not surprised that you already have. we do a lloottttt of this haha

edit:
what if you were to put enough water in the tank to submerge the wood, stuck the wood in, marked the height the water rises to, take the wood out, add water (keeping track of amount) until you reach that line. that way you don't have to overflow?

 

[fatheadminnow]

hahaha FHM, i saw this and thought i'd be able to help

not surprised that you already have. we do a lloottttt of this haha

Maybe next time you'll get me...lol.

-FHM

 

[BigC]

Dont forget Mel when calculating displacement you'll have to allow for substrate depth and the water level from the top of the tank aswell as the rockwork etc.
Regards
C

 

[england]

wow i just syphon some water, put the thing's into the tank and after top up tank, but i did not do well at school

 

[MermaidMel]

wow i just syphon some water, put the thing's into the tank and after top up tank, but i did not do well at school

It really doesn't bother me, it's just curiosity that's all

Like before I had a 55 gallon with about 60kg of wood and slate not to mention 2 inches or more of substrate
So I had probably 40 gallons of water but stocked it as a 55 gallon

Now I have a 50 gallon with 3 bits of wood and an inch of substrate I am probably keeping my whole 50 gallons and could even have more stock

It's just banter, no need to put yourself down about school lol I was worse I betcha