Calculating volume in metric

[Martin KyteParticipant @martinkyte99762]

Why don't you just use an online converter.

http://www.onlineconversion.com/

Martin

[FMESParticipant @fmes]

Interestingly enough I have to teach new apprentices Imperial measurement as the majority of Nuclear power stations were built to this standard.

Strange thing is that they (the apprentices) mostly convert very easily as they state Imperial is more divisible than metric.

[Danny M2ZParticipant @dannym2z]

Posted by Lofty76 on 03/01/2014 09:17:19:

Interestingly enough I have to teach new apprentices Imperial measurement as the majority of Nuclear power stations were built to this standard.

Strange thing is that they (the apprentices) mostly convert very easily as they state Imperial is more divisible than metric.

In some cases I have to agree. 1/3 is much nicer than 0.3333333333333333 – ad infinitum.

* Danny M *

[Mark CParticipant @markc]

Mike, that's not going to work in engineering – too confusing, it looks more like a DIN steel spec!

I would like to know where you get the information on that notation being "correct". I have to prepare tech. docs often and was only aware of the current standards regarding standard letters, fonts and the often missing space? The notation you used looks very much like the modern system for resistance values but I have never seen it applied to anything else.

Mark

[Michael GilliganParticipant @michaelgilligan61133]

MikeW,

Whilst I agree wholeheartedly about the clarity brought by using the descriptor letter as a "decimal point" … I must respectfully mention that; in the SI, lower case letters are used for both "metre" and "milli".

MichaelG.

.

This is probably the most convenient reference that I have found to the SI units

But Note: it'sfrom NIST and therefore uses the American spelling [meter] instead of metre.

[steveteeParticipant @stevetee]

I was aware of the difference between 20l and 20 l , I was just writing it out as it's easier to read it that way.

One of the great advantages of the imperial system is its computational ease, using a mixture of fractions and thousandths of an inch, meant it was easy to visualise, yet precise .

Oh and before someone mentions it , I know that in English it's thirty seconds of an inch, in engineering, ( when I were a lad) measurements were spoken as thirtytwo's or thirtytwoths. Thirty seconds was what we got for a tea break ( joking).

I know a Kiwi lad, who learn imperial in School, then they all went metric in NZ, then he moved to USA and had to relearn imperial again.

[roy entwistleParticipant @royentwistle24699]

Mike reminds me of when my nephew ( a time served chippy ) was putting me some shelves up and measured them as 2 metres 4inches

I always understood that you don't mix metres and millimetres or grams and killograms also decimetres shoul have been left in the classroom

Roy

[jason udallParticipant @jasonudall57142]

It makes me smile.
The si unit for length..m
SI unit for time S
Temp K ( not degree Kelvin !)
And use of micro milli ..kilo mega.
Now the unit of MASS kg…kilo gramme…wtf!
The base unit is kilo something…!
I am aware of the history..but it still makes me chuckle.

[NJHParticipant @njh]

Hi Roy

| "and measured them as 2 metres 4inches"

Guilty I'm afraid !

I wouldn't dream of mixing measurements in the workshop but must admit to doing so on D-I-Y projects around the house. Its more a matter of swinging around on top of a step ladder and finding the line on the rule that aligns with the edge of the thing being measured. For instance 100in + 5cm (as shown on the rule) lines up exactly and I can remember this to note down. The correct measurement is of course 2550mm or about 8ft 4 3/8in. Not easy to find on an extending rule!

Norman

[Oompa LumpaParticipant @oompalumpa34302]

Posted by NJH on 03/01/2014 17:08:25:

Hi Roy

| "and measured them as 2 metres 4inches"

Guilty I'm afraid !

I wouldn't dream of mixing measurements in the workshop but must admit to doing so on D-I-Y projects around the house. Its more a matter of swinging around on top of a step ladder and finding the line on the rule that aligns with the edge of the thing being measured. For instance 100in + 5cm (as shown on the rule) lines up exactly and I can remember this to note down. The correct measurement is of course 2550mm or about 8ft 4 3/8in. Not easy to find on an extending rule!

Norman

I buy most of my rules and tapes from either the US or Germany. That way at least they are one or the other. I cannot cope with this mix of metric one side Imperial the other. Digital Calipers and micrometers are just terrific, easy to swap between the two.

graham.

[Gordon WParticipant @gordonw]

I can't believe the stuff this thread has thrown up. Only unit that should be banned is centimeter, used by lino shops and soft furnishing salesmen.

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by Gordon W on 04/01/2014 09:51:59:

I can't believe the stuff this thread has thrown up. Only unit that should be banned is centimeter, used by lino shops and soft furnishing salesmen.

Hi, and dressmakers.

Regards Nick.

[Gordon WParticipant @gordonw]

No experiance of dressmakers Nick.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Gordon, don't get me wrong, I'm not into dressmaking, but one of my younger sisters does as a pass time, but more over for saving money when all her children and my other sisters children were kids she used to make and or alter a lot of clothing for them and also made a number of bridesmaid dresses ect. when some of them got married.

Regards Nick.

[Ian S CParticipant @iansc]

I'd have thought 20 L would be less confusing than the lower case l, but I suppose the l is the convention.

Ian S C

  Just been for a stroll around google.  Since 1979 litre maybe written using either uppercase or lowercase, prompted by the similarity of lowercase to the numeral 1.  USA recommends that within the United States "L" be used rather than "l"

Edited By Ian S C on 04/01/2014 11:25:02

[JC Uknz 1Participant @jcuknz1]

Bred in England and learnt Imperial though using mm as a useful small size, came to NZ and enjoyed the metrification process, joined a Model Engineering Society and learnt about thous and swg, bought an old sewing machine so occasionally do frequent drapery stores …. what does baffle me after owning a an american originated car, a Aussie Holden, the 'funny' american numbering system …. thankfully my most recent cars have been japanese cast offs using metric, so I have a toolbox full of whuitworth and SAE? , good tools last a life time …. and I have been to the lumber yard for a 100×2 bit of timber Then there were the firms who adapted to metrification by not selling whole metric things but imperial sizes converted to metric like 12.7 … less common now but a problem when you want the proper tapping drill for a metric screw.

How many of you have wives who measure an inch as the thumb knuckle to nail tip?

[FMESParticipant @fmes]

Posted by JC Uknz 1 on 04/01/2014 20:37:41:

How many of you have wives who measure an inch as the thumb knuckle to nail tip?

Not me, but I do still gap spark plugs with my 25 thou thumbnail

[Sub MandrelParticipant @submandrel]

Not my wife, but I do. 4" across the palm of my hand, yard from fingertip to nose, two yards across my span, 2000 steps (1000 double paces) in a mile (mille). My tiny feet are only 10" long…

I won't repeat the old joke as there may be unmarried men present!

Neil

Just checked and my thumb works out at  1 3/4" along the first joint! I need to get standardised!

Edited By Stub Mandrel on 04/01/2014 21:13:59

[robjon44Participant @robjon44]

Two things, I remember reading many years ago that Thomas Edison asked some high flying mathematician who worked for him to calculate the internal volume of the glass envelope of a light bulb, having burned the midnight oil to arrive at a figure he was then informed that he was incorrect, Mr.Edison then filled the bulb with water & poured it into a glass measuring cylinder, job done! That may well be an apocryphal story ( 20 dollar word ) .

Next & this really happened to me, I was working for a small subcontract engineering company owned by a father & son, they were well on the way to bankrupting their enterprise like every other business they had owned, of the original 7 turners the apprentice & I were the only ones left, & that was only because I had yet to snag another job. The highly educated son posessed a scientific calculator that had no less than 3 fold out keyboards that really needed to be plugged into a 3 phase supply to work properly, he was working on a large fuel tank calculation & our working relationship was already beyond repair when he stalked up & said " whats the conversion factor for gallons to litres?" I duly reeled it off to 3 places of decimals & he snarled "I suppose you walk about with figures like that in your head do you?" & I said "no but if you look on the window sill in front of you there is a container that says in big writing Halfords Distilled Water , 1 Gallon, 4.545 Litres" he stormed away, never spoke to me again & I left a week later, well, I was only trying to help Bob H

9

[Boiler BriParticipant @boilerbri]

Glad i found this thread:

Your help please:

Cylinder bore 20mm = 10 x 10 = 100 * 3.142 (pi) = 314.2 (Square mm) / 100 = 3 (mL) per mm of travel?

 

Is this correct?

 

Bri

Edited By Boiler Bri on 19/03/2014 20:49:54

[JasonBModerator @jasonb]

I make it 0.3ml

May be easier to work it out in cc which is cubic centimeter as 1cc = 1ml

1cm radius x 1cm radius x 3.142 Pi x 0.1piston movement

 

Edited By JasonB on 19/03/2014 21:00:48

[jason udallParticipant @jasonudall57142]

. mL ( usally ml but more correctly mL) is 1/1000 L ( or as now obsolete dm 3 decimetre)

now a 100 by 100 by 100 mm cube is one litre or 1,000 000 cubic mm

so in mL thas 1000 cubic mm to the mL

so 10* 10 *3.14…….in mm is 314.2 square mm thus 314.2 cubic mm per mm of stroke

so I would say a third of a mL per mm..( 1/3.142…; )

[Boiler BriParticipant @boilerbri]

Great help guys.

Thank you

Bri

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