Squirrel Girl wrote:
Hydrostatic Weighing
This is just a fancy way of saying underwater weighing. Like DEXA, this test is one of the more accurate ones. How it works:
* You sit on a scale inside a tank of water and blow out as much air as you can
* You are dunked underwater, where you blow out even more air
* Since fat is lighter than water, the more fat you have, the more you'll float. The scale measures underwater weight to figure out body density.
* The margin of error is around 2-3%, but the accuracy depends on the amount of air you expel. You have to blow it ALL out or it won't be as accurate.
* This is a difficult way to measure body fat since it can be uncomfortable and even scary to be dunked underwater with no air in the old lungs.
Could I recommend an easier alternative? Borrowing the logic from another source...
Quote:
BEDEMIR: Tell me, what do you do with witches?
VILLAGER #2: Burn!
CROWD: Burn, burn them up!
BEDEMIR: And what do you burn apart from witches?
VILLAGER #1: More witches!
VILLAGER #2: Wood!
BEDEMIR: So, why do witches burn?
[pause]
VILLAGER #3: B--... 'cause they're made of wood...?
BEDEMIR: Good!
CROWD: Oh yeah, yeah...
BEDEMIR: So, how do we tell whether she is made of wood?
VILLAGER #1: Build a bridge out of her.
BEDEMIR: Aah, but can you not also build bridges out of stone?
VILLAGER #2: Oh, yeah.
BEDEMIR: Does wood sink in water?
VILLAGER #1: No, no.
VILLAGER #2: It floats! It floats!
VILLAGER #1: Throw her into the pond!
CROWD: The pond!
BEDEMIR: What also floats in water?
VILLAGER #1: Bread!
VILLAGER #2: Apples!
VILLAGER #3: Very small rocks!
VILLAGER #1: Cider!
VILLAGER #2: Great gravy!
VILLAGER #1: Cherries!
VILLAGER #2: Mud!
VILLAGER #3: Churches -- churches!
VILLAGER #2: Lead -- lead!
ARTHUR: A duck.
CROWD: Oooh.
BEDEMIR: Exactly! So, logically...,
VILLAGER #1: If... she.. weighs the same as a duck, she's made of wood.
If fat floats, and wood floats then logically the higher the difference in weight between you and a duck the skinnier you are. Anyone know how much a duck weighs on average?
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Quote:
In comic strips the person on the left always speaks first. - George Carlin