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The expenditure of £5 - 10,000 seems very reasonable if the result disproves all that we know about physics.Given the chance of a Nobel prize if he's right, Mr Yaniv should now put his money where his mouth is. Happy to donate a week of my time at the Cavendish, Engineering or Chemistry labs near here, Leeds, Imperial, or wherever Yaniv can find a bench and some kit.
Calculating the temperature rise means knowing the laser power exactly.That's not a very difficult thing to measure, but I'd rather not have to.
The Cahn balance is a null device, so you can calibrate it with milligram weights, IIRC.
No problem.I can borrow a laser power meter.
The expenditure of £5 - 10,000 seems very reasonable if the result disproves all that we know about physics.Given the chance of a Nobel prize if he's right, Mr Yaniv should now put his money where his mouth is. Happy to donate a week of my time at the Cavendish, Engineering or Chemistry labs near here, Leeds, Imperial, or wherever.
Quote from: alancalverd on 28/01/2018 11:28:45The expenditure of £5 - 10,000 seems very reasonable if the result disproves all that we know about physics.Given the chance of a Nobel prize if he's right, Mr Yaniv should now put his money where his mouth is. Happy to donate a week of my time at the Cavendish, Engineering or Chemistry labs near here, Leeds, Imperial, or wherever.
Find me a set of instructions for a decent balance that doesn't explain that you shouldn't weigh hot things, because of convection currents.
Alan"50 microgram is a heck of a lot, if converted to energy. 4500 joules"I feel you have underated the value of c by a factor of 1000 also you have not taken into account the the specific heat of the sample and assumed it to be unity which is unlikely.This of course shows that the suggestion put forth by Yaniv is even less likely to be true
The is another paper measuring weight of a heated thermal insulator decreases at increasing temperature.http://intellectualarchive.com/getfile.php?file=ueSLj97NCAp&orig_file=A_Dmitriev__Weight.pdf
And a piss poor paper it is too.It fails to mention the words vacuum or convection- so it hasn't dealt with the biggest problems involved in making such a measurement.It also doesn't talk about how they addressed magnetic fields produced by the heating current.It's a waste of bandwidth.
Weighing the apparatus in vacuum should completely eliminate heat convection.
he outer vessels were specifically designed to reduce heat convection.
The electric heater was switched on for 20 seconds
Weighing the apparatus in vacuum should completely eliminate heat convection.They didn't.That's my point.
he outer vessels were specifically designed to reduce heat convection.Reduce it to zero?
And, when they switched it on the weight suddenly jumped down, even though any change in temperature would obviously be more gradual.So...Whatever the effect is, it's not temperature.
Nobody is going to bother doing an experiment they know will "fail" - even if it gives them an excuse to play with lasers.