dave,

Agree totally about the volumetric differences between people of the same
weight and the amount of water they will displace. That, added to to the
varying volume of water depending on salinity and temperature would make any
meaningful calculation based upon the information provided a bit unhelpful.
The bathroom floor will get wet.

Mike

"Dave F" wrote:

The effect of body structure on volume is that a person who is more muscular
than normal will have a higher density than a fatter person. Therefore a
muscular person who is the same weight as a fat person will take up less
volume.

But they will displace the same amount of water because they weigh the same.
I'm not sure what body structure differences have to do with your question?

Dave
--
Brevity is the soul of wit.


"Mike" wrote:

having established that, where will the displaced water go? Will it spill
over the side or is the purpose of the question to decide how much ullage
must be left in the tub prior to someone having a bath. I suggest a bund
around the tub with a mimimum capacity of 110% of the tub capacity.

1000kg of water @ 21c has a volume of 1m3. What is the volume of 1000kg of
water @ 40c and what is the effect of body structure on body volume. Discuss.

"Dave F" wrote:

To be more succinct:

If 100 lbs displaces 1/2 cubic foot of water, and
1/2 cubic foot of water equals 4 gallons, then the ratio 100 lbs : 1/2 cubic
foot : 4 gallons holds.

So you could construct a table with the column headings Weight | Volume,
cubic feet | volume, liquid and populate it according to the above ratio:

A 50 pound person would displace 1/4 of a cubic foot, which is 2 gallons of
water.

A 200 pound person would displace 1 cubic foot of water, which is 8 gallons
of water
--
Brevity is the soul of wit.


"Dave F" wrote:

Displacement generally refers to the volume of water displaced when an object
is put in its container.

Given the numbers you have below, I would start with the relation 1001bs
displaces .5 cubic feet of water. Presumably 200lbs discplaces a cubic foot
of water, which, by your relation 8 gallons = 1 cubic foot, you know that a
200 lb person displaces 8 gallons of water.

You have the information you need; you just need to work through it. I
don't know what the dimensions of a tub would get you, and I'm not sure why
you would need a person's height.

Dave
--
Brevity is the soul of wit.


"Darryl" wrote:

Hello.

Excel Newbie here. I've been asked to create a spreadsheet that will
calculate the gallons of water needed based on the Height and weight of
a person going into a walk-in bathtub with a door. It is really to
determine how large of a tub to put in for a person based on their
size.

I'm guessing you will need information on the dimensions of the tub?
The client mentioned water displacement, and the numbers that follow

Here is what he told me he found out about water displacement

63 lbs will displace w62lbs of water
100lbs displaces ½ cubic feet of water
1 gallon weighs 8lbs
8 gallons = 1 cubic foot

I'm not sure where to EVEN start with this. Am I over my head, or do I
even have enough information?

Thanks for the help.