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Imperial units. Definitions?

F

FrustratedUser

Lifer
What are the imperial units based upon, and how are they defined.

Who and how defined how long an 'inch' should be?
How do the inch relate to volumetric dimetions like 'cups', 'oz', 'lbs'?
5280 feet / 1 mile. Why this very inconvenient number (5280 could be wrong, I don't remember).
1 gallon = ???? of 'oz'. And how does it relate to 'lbs'?

As you might understand from this thread I am completely confused with the imperial system since it's new to me.
 
Ok, units of volume do not relate to weight, so gallons don't ever relate to pounds. That being said, there is such a thing as a fluid ounce and an ounce by weight, so be careful not to confuse the two. As far as the rest of the system goes, it is just confusing. I don't have a good explanation as to why the conversion factors are like that... no one does... they just suck. However, if you are going to be in the USA, learn to live with it and not complain too much.

Ryan
 
and then the US and UK versions are slightly different to boot :Q

to answer one of you q's, fluid ounce != ounce.

1 gallon = ???? of 'oz'. And how does it relate to 'lbs'?
Click to expand...
1gal is.. uh i think 133.33 fluid ounces (think thats a UK gallon..)

WTF are you talking about though.. mass has no relation to volume.

16oz - lb

 
Don't take the post the wrong way.
I now live here and is just trying to understand how it works.
Is there a simple way to understand.
Ex.

'fl.oz' related to 'gallons'
'cups' to 'gallons'
'cups' to 'fl.oz'

'oz' to 'lbs'

I know that 12 inch is a foot. 3 feet is a yard.
 
Okay. Liquidwise, an ounce is the lowest unit you should see. You...should know how much an ounce is. Now, there are 8 ounces in a cup. There are 2 cups (16 oz) in 1 pint. There are 2 pints (32 oz) in 1 quart. There are 4 Quarts (32 x 4 = 128) in one gallon. Simple as that.
 
Originally posted by: PsychoAndy
Okay. Liquidwise, an ounce is the lowest unit you should see. You...should know how much an ounce is. Now, there are 8 ounces in a cup. There are 2 cups (16 oz) in 1 pint. There are 2 pints (32 oz) in 1 quart. There are 4 Quarts (32 x 4 = 128) in one gallon. Simple as that.
Click to expand...

OK.
How much is an ounce?
 
1 oz is approximately 28.3g

In Imperial measurement there are 27 11/32 grains in 1 dram and 16 drams in 1 ounce.

This works out so that there are 7000 grains in 1 lb.
 
Originally posted by: Haircut
1 oz is approximately 28.3g

In Imperial measurement there are 27 11/32 grains in 1 dram and 16 drams in 1 ounce.

This works out so that there are 7000 grains in 1 lb.
Click to expand...

I think he was asking how much a fluid ounce is, not an ounce by weight.

1 fluid ounce is 1/8 of a cup. There must be a metric conversion somewhere...

Ryan
 
Well, there are 20 fl. oz in 1 UK pint, which is 568ml

This works out to 28.4 ml for 1 fl. oz.

IIRC the number of mls in 1 fl. oz is not the same as the number of grams in 1oz even though they are very similar.
 
Originally posted by: Colt45
and then the US and UK versions are slightly different to boot :Q

to answer one of you q's, fluid ounce != ounce.

1 gallon = ???? of 'oz'. And how does it relate to 'lbs'?
Click to expand...
1gal is.. uh i think 133.33 fluid ounces (think thats a UK gallon..)

WTF are you talking about though.. mass has no relation to volume.

16oz - lb
Click to expand...

gallon = 128 fluid ounces
 
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