Metric Fuel Consumption

[Toltec]

TooMany2cvs said:

The SI unit of angular measure is the radian, anyway, defined in 1714 by Roger Cotes, who worked closely with Isaac Newton. One radian is the portion of a circle where the circumference is the same as the radius. Nice, easy, natural division.

There's a couple of theories as to why there's 360deg in a circle - the Persian calendar had 360 days, and the Babylonians used base 60 for counting.

The Babylonians used the ratios of the sides rather than angles in their trigonometry. There are some interesting videos on YouTube on the old Babylonian sexagecimal system.

[RBH58]

Funny. Aus has totally embraced metric (as we should have seeing as metric is the only legal measurement system we’ve had here for 30 years). But curiously, people still talk PSI for tyre pressures. Go figure.

[Toltec]

RBH58 said:

Funny. Aus has totally embraced metric (as we should have seeing as metric is the only legal measurement system we’ve had here for 30 years). But curiously, people still talk PSI for tyre pressures. Go figure.

I doubt many people would even know what a Pascal is let alone how many they need to put in a tyre.

[RBH58]

Funny. Aus has totally embraced metric (as we should have seeing as metric is the only legal measurement system we’ve had here for 30 years). But curiously, people still talk PSI for tyre pressures. Go figure.

[TooMany2cvs]

Toltec said:

RBH58 said:

Funny. Aus has totally embraced metric (as we should have seeing as metric is the only legal measurement system we’ve had here for 30 years). But curiously, people still talk PSI for tyre pressures. Go figure.

I doubt many people would even know what a Pascal is let alone how many they need to put in a tyre.

They're usually quoted in bar. 29psi = 2 bar

[saaby93]

Mr2Mike said:

TooMany2cvs said:

An American cup is.
A metric cup is 250ml.
An imperial cup is 284ml.
A Canadian cup is 224ml.
A Japanese cup is 200ml.
A Latin American cup is either 200ml or 250ml.

I do apologise - there is a second common definition of a teaspoon - the US teaspoon is not exactly 5ml, it's 4.9289ml.

The size of a cup is pretty irrelevant,

To save confusion arent cup sizes based on letters?

[Toltec]

TooMany2cvs said:

Toltec said:

RBH58 said:

Funny. Aus has totally embraced metric (as we should have seeing as metric is the only legal measurement system we’ve had here for 30 years). But curiously, people still talk PSI for tyre pressures. Go figure.

I doubt many people would even know what a Pascal is let alone how many they need to put in a tyre.

They're usually quoted in bar. 29psi = 2 bar

Which again is a convenient historic usage and not an SI unit, just like using 100km as a unit in l/100km instead of cl/km which would give the same figure, but in SI correct units and prefixes.

Given you might want to set your tyre pressure to 2.8bar +/- 0.05 there is no reason not to use 280kPa +/- 5 instead, same number of digits without mucking around with a decimal point.

[Vanin]

The metre was based on an attempt to measure the distance between the equator and North Pole that is true
The way they did it in 1793 was to measure the distance between Barcelona and Dunkerque.
The problem was that the Earth is not perfectly round and there is a dimple on that particular line so the original metre was based on a false measurement since corrected but not a great start

Yes we have ten fingers but some wise folk long ago decided that the duodecimal system worked better in a market situation hence we still have wine and eggs by the half dozen as five of either does not fit into normal packaging

[smallgun]

Although I’m of an age where I still think in imperial when it comes to mpg I now think in miles per litre simply because it’s easier to work out how many litres I need when I fill the car with fuel.

[TooMany2cvs]

smallgun said:

...simply because it’s easier to work out how many litres I need when I fill the car with fuel.

Isn't the answer to that always "As many as will go in until it's full"?

[donkmeister]

TooMany2cvs said:

The fact that Canada has to buy Dibnah stuff from the neighbours doesn't mean Canada shouldn't be metric, though. I'm surprised that the fitters aren't aware of the issue.

Speaking as one whose family are mostly Canadians living in Canada I can confirm that many Canadians, even clever ones born in the 1990s with degrees, professional jobs and bilingualism use feet, pounds etc when measuring the human body. I assumed, mistakenly, that they used metric but apparently not in such day-to-day.

[donkmeister]

RBH58 said:

donkmeister said:

I'm all for distance/volume whether it be mpg or km/l (the latter is used in Oz i understand).

Regardless of whether you are for distance/volume or volume/distance L/100km doesn't work as a unit. L/km or l/1000km would not upset me as they are metres to the third and sixth power of 10 and therefore proper in the metric system... but a hecto-kilometre?!
Raise a unit to the 5th power? bks. Do you inflate your tyres to Pascals of pressure? Nope. 5th power again. Stupid idea.

Aus uses L/100km

Ah, you are correct and Australia do indeed use that god awful "unit per one hundred thousand other units" unit.

Eurgh, yuck.

[Vanin]

And we have not yet mentioned that God like figure which means so much to testosterone fired Pistonheaders, I refer of course to cubic inches

Those magical "Shelby 427" or 289 Cobra or Plymouth 426 Hemi Cuda or 440 RB oooooooh, my mouse has gone all shaky and just fainted!