time??

[Paddymanc]

Twins, seperated at birth.......one lives at the top of a mounatain and the other lives at the bottom. Is it theorectically true that if they met up after,say 70 years, one would actually be younger then the other.......? 
 

 

[jake-the-peg]

Yep, time dilation due to a gravitaional field (in theory weaker up the mountain) - general relativity.

However in practice the particular geology of the area and the location of the earth they lived in could have a greater effect on the gravity than the altitude and so this could quite easily be cancelled out.

The difference would be scarcely measurable anyhow.

This effect was once demonstrated by synchronising two atomic clocks and flying one around the world in a 747 and showing how one had slowed in comparisom to the other

[steveb]

how about some one who spent most of their working lives driving at 70 mph up and down motorways as their career, compared to a recluse who spends their entire life in their home, moving very little?

[Sequin]

One would always be younger than the other - the one that was born second!

[kempie]

...unless one twin was gestated in a surrogate womb and both women gave birth simultaneously.

[jake-the-peg]

Just did some maths very crudely but by my recoking somebody who spent their life at 70mph would have a difference of .00003 seconds at the end of their three score years plus ten