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Is there anything in the world that is perfect in The AnswerBank: Science
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Is there anything in the world that is perfect

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mallymooface | 14:00 Fri 09th Nov 2007 | Science
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I read recently that there is a perfect kilo weight which is losing weight and so no longer is a perfect kilo weight. This made me think is anything else in the world able to be described as perfect. How for example do you get a perfectly round shape? How do we know an inch is exactly an inch?
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what is perfection?
if you dont know this than how can anything be perfect?
The Weights and Measures Act 1985 defines One Yard as 0.9144 metres exactly and one inch is defined in the same act as being 1/36 Yard.

One metre is defined as the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.

We can be certain then, that an inch IS an inch.

I heard a programme on the radio the other day and they are looking at a different method of defining the kilo because can vary if based upon a physical prototype
My fiancee is perfect.
I think I am married to your fiance, squarebear
I think that things are "perfect enough" to whatever tolerances you desire or can measure.

When the need for improved accuracy becomes apparent then a new level of rigour in measurement is devised.

Witness the changes in the standard metre, defined originally as the distance between two marks on a metal bar in Paris, then later as the number of wavelenghts as stated above anf I beleive that they are considering a new standard now as the old one is not good enough.
Also my spelling above, oops!
The original metre was actually one ten-millionth of the distance between a point on the equator and the North Pole, with this line passing through the centre of Paris- The size of the metal bar was based on this. The problem with having a metal bar as a template is that its size will change with temperature.

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