# The Naked Scientists Forum

### Author Topic: Do We have 1 kg Master in Paris ?  (Read 1189 times)

#### machmarosz

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##### Do We have 1 kg Master in Paris ?
« on: 22/11/2015 09:25:23 »

In physics exist

NORMAL  TEMPERATURE

NORMAL AIR's prasure

DO WE NEED NORMAL EM RADIATION ?

HOW HEAVY IS  1 kg ?

THEORY :
James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects.

SI units :
ENERGY / SPACE  =  [ Joul / cubic meters  = Newton *meter / cubic meters  =  N/m^2 ]

0,001 mm  sheet has got near 100 m^2  area !!!

I Maciej Marosz my own opinion  ( I don't know )
but Each material need separate master

#### Bored chemist

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #1 on: 22/11/2015 13:38:13 »
"Do We have 1 kg Master in Paris ?"
Yes.
To convert to pressure we divide by C
so that's 3 810^-15 pascal
The test mass isn't very big- less than 2 inches across so that's an area of less than 1/400 of a square metre
Corresponding to a force of something like 10^-17 Newtons.
On the other hand, the weight of the standard kilogram is about 10 Newtons.

So, the CMBR would make a difference to the observed weight of about 1 part in a million million million.

That's a change of about a tenth of a thousandth of a millionth of the best accuracy to which we can measure it.

There are other things more significant.
For example, if the person looking at the standard kilogram is a metre away from it and weighs 70 kg he will exert a local gravitational pull on it of about 5 billionths of a Newton. That's more than a billion times bigger than the effect of the CMBR.
Of course, if they are looking at it, the lights must be on.
Typical light levels in an office are of the order of 1 watt per square metre- that's roughly a million times more than the CMBR and so it produces an effect roughly a million times bigger (though that's still a million times less than we can measure).

#### machmarosz

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #2 on: 22/11/2015 16:38:22 »
EXIST STATICA and DYNAMICA !!!

for Car 80 km/h it is not aerodynamic problem

but the same car and 160 km/h = AERODYNAMICA

HOW HEAVY IS 1 kg ???

BODY's SHAPE   PLANET'S SHAPE  ???

#### machmarosz

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #3 on: 22/11/2015 16:40:24 »

When Eistein took Atomic clock to Airplane  What he did for physics ?

In my opinion he joust change radius !!!

#### machmarosz

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #4 on: 22/11/2015 16:44:29 »

HOW HEAVY IS ELECTRON

V^2 it is strong variable !!!

DOUBLE SLITS ???

How EM preasure is pushing ELECTRON ?

#### machmarosz

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #5 on: 22/11/2015 16:48:33 »
HOW BIG FORCE IS PUSHING SATELLITE ???

HOW FAST IS EM PREASURE ?

CAN WE USE DYNAMICA TO EVALUATE MOTION ?

#### evan_au

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #6 on: 22/11/2015 16:49:06 »
Metrologists are concerned about their ability to accurately measure 1kg in the lab.

Over the past 100 years, the mass of the master kg in Paris has diverged from many of its sister copies kept in other countries, by up to 75μg. The exact cause is unknown, but could be due to atmospheric pollutants on the surface, or absorption of hydrogen or mercury into the surface (it is kept near a mercury thermometer, and mercury is notoriously volatile and readily forms alloys with many metals).

This is a much larger deviation than can be explained by the CMBR, or by the mass of the scientist performing the measurements.

If the shape of the kg affected the measurement of its mass, then fortunately, the shape has been kept constant (although it is shaped suspiciously like the Urbamobile?). The density of the kg definitely affects the measurement of its mass, since an iron mass displaces a different amount of air than the platinum/iridium original.

Efforts are underway to replace the physical master kg by another technique which could (in theory) be reproduced in other laboratories. It was eventually decided to base the new standard on Plank's constant, although there were competing proposals like counting atoms, or measuring the force of an electric current.

So, in the not-too-distant future, the answer to this question will be "no". The existing platinum-iridium cylinder will cease to be the Master, and will be transferred to the museum which now displays the standard meter (the meter is now defined by the wavelength of light).

#### machmarosz

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #7 on: 22/11/2015 16:53:28 »

#### Bored chemist

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #8 on: 23/11/2015 20:02:32 »
Metrologists are concerned about their ability to accurately measure 1kg in the lab.

If the shape of the kg affected the measurement of its mass, then fortunately, the shape has been kept constant (although it is shaped suspiciously like the Urbamobile?). The density of the kg definitely affects the measurement of its mass, since an iron mass displaces a different amount of air than the platinum/iridium original.

At this level of precision, the mass is "weighed" in a vacuum chamber so that volume doesn't have an effect.
There are also lots of other things they have thought of but the CMBR is  vastly too small to matter.

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##### Re: Do We have 1 kg Master in Paris ?
« Reply #8 on: 23/11/2015 20:02:32 »