Le Grand K and ( scrambled ) Egg Heads

bernardgreen

bernardgreen

Joined
3 Nov 2006
Messages
28,315
Reaction score
3,370
Location
Bedfordshire
Country
United Kingdom
Rather than rely on a platinum cylinder in a bell jar in Paris, eggheads in the world of measurements want to anchor the future kilogram to Planck’s constant. This is a fixed quantity tied in with E=MC2 and quantum theory, specifying the amount of energy carried by a single particle of light, or photon. And that’s just the most extremely simplified version.

Read more here from where that quote was taken
 
Sponsored Links
The kilogram is dead, long live the kilogram!
 
kilogram.png
 
Sponsored Links
How do they know their platinum cylinder has changed. What are they weighing it with?


Can they redefine the gallon so my car has better fuel consumption?
 
There are lots of people in the Tory party who can redefine anything you like, and make it sound better than what we already have.

And 17+ million people stupid enough to believe them.

So yes - they can do as you ask.
 
ban-all-sheds said:
There are lots of people in the Tory party who can redefine anything you like, and make it sound better than what we already have.

And 17+ million people stupid enough to believe them.

So yes - they can do as you ask.
Click to expand...
Yawnnnnnnnnnnn
 
Under Labour a 1Kg would weigh more or less depending who was asking, what they wanted it weigh, what someone else said it weighed and of course Diane abbot would be doing the weighing, so it would probably be broadly equivalent to.. hang on what was the question?

serious answer - they are comparing its mass to copies (from the original article). But it could be that gravity is changing, in which case we are all doomed.
 
motorbiking said:
Under Labour a 1Kg would weigh more or less depending who was asking, what they wanted it weigh, what someone else said it weighed and of course Diane abbot would be doing the weighing, so it would probably be broadly equivalent to.. hang on what was the question?

serious answer - they are comparing its mass to copies (from the original article). But it could be that gravity is changing, in which case we are all doomed.
Click to expand...

Doesnt gravity vary with latitude and altitude?

Since the earth isnt a perfect sphere, that 1kg would have a higher mass at the poles.
 
You weigh more at the poles than the equator, but your mass remains the same.
 
Notch7 said:
Doesnt gravity vary with latitude and altitude?

Since the earth isnt a perfect sphere, that 1kg would have a higher mass at the poles.
Click to expand...
g varies.G is constant
 
Last edited by a moderator:
It would weigh more because of the centrifugal force of the earth spinning. A similar effect is caused by the moon and sun on the sea when they are in alingment (spring tide).
main-qimg-58036f61af8f1d01722b7149dda1bc5a
 
There are 'Extreme' differences in gravitational acceleration across the globe.

Models predict a gravitational acceleration of 9.78m/s2 at the equator, and 9.83m/s2 at the poles (approx 5/1,000 difference).

But actual measurements show unexpected locations with more extreme differences.
The top of Mount Nevado Huascarán in Peru (1000km south of equator) has the lowest gravitational acceleration of 9.76 m/s2, while the highest is at the surface of the Arctic Ocean (near Pole), at 9.83 m/s2 (approx 7/1,000 difference).

These differences mean that if you fall from a height of 100 metres at each point (and ignore the diffrent air resistances as one if much higher than the other), you would hit the surface in Peru about 16 milliseconds later than if you fell in the Arctic (you fall slower in Peru than the Arctic).
You also gain 1% of your body weight in moving from the Peruvian mountaintop to the Arctic, although your mass would not change.

https://www.newscientist.com/article/dn24068-gravity-map-reveals-earths-extremes/
 
You must log in or register to reply here.
Sponsored Links
Back
Top