6 ms·

Would it be possible to replicate that on mobile phones? Or a special device is required? 1. trying to figure out the feasibility?

thesz 3y ago
https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensate https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensa... "n condensed matter physics, a Bose–Einstein condensate (BEC) is a state of matter that is typically formed when a gas of bosons at very low densities is cooled to temperatures very close to absolute zero (−273.15 °C or −459.67 °F)..." I guess, a special device is needed. The size of such device will be in thousands of mobile phones just in volume needed. Yet, it is feasible. ;)
- wongarsu 3y ago
  There wasn't much money in miniaturizing them so far. Cooling down tiny amounts of matter is much easier than cooling down larger amounts, so maybe there's hope for a microchip sized BEC in 20 years.
  - ClumsyPilot 3y ago
    whats the smalled device to contain a gradient of 300 degrees C? this is a but solly, like saying you will eventually have a fridge the size if a m9bile phone - us it usefull?
  - thesz 3y ago
    Let us take a look at what boson is. https://en.wikipedia.org/wiki/Boson https://en.wikipedia.org/wiki/Boson "multiple identical composite bosons (in this context sometimes known as 'bose particles') behave at high densities or low temperatures in a characteristic manner described by Bose–Einstein statistics: for example a gas of helium-4 atoms becomes a superfluid at temperatures close to absolute zero." Helium leaks as nothing else, even more than hydrogen. Here's some leak rates of heilum: https://www.researchgate.net/figure/Comparison-of-the-helium-leak-rate-for-samples-with-different-bonding-materials_fig4_262953618 https://www.researchgate.net/figure/Comparison-of-the-helium... Let's say we have a um^3 of helium in the device proposed. Let's assume leak rate of 8*10^-9 of cm^3/sec. (1e-6/1e-2)^3/(8e-9) is equal to 1.2499999999999998e-4 - all helium will leak in 1/8 of microsecond in the device proposed. I hope this helps.
jubjubbird 3y ago
The MEMS accelerometers in our phones are in theory sensitive to gravity changes, but they're not nearly sensitive enough. This group is trying to improve the MEMS sensing technology, but it's doubtful it will be as good as classical gravity meters (falling mass, or spring) or quantum (BEC) ones: https://www.gla.ac.uk/research/beacons/nanoquantum/wee-gglasgowsgravimeter/ https://www.gla.ac.uk/research/beacons/nanoquantum/wee-gglas... One important distinction is between measuring gravity (generally, acceleration in the vertical direction) and the gravity gradient. The latter is generally easier and more useful for navigation.

thesz 3y ago

https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensate https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensa... "n condensed matter physics, a Bose–Einstein condensate (BEC) is a state of matter that is typically formed when a gas of bosons at very low densities is cooled to temperatures very close to absolute zero (−273.15 °C or −459.67 °F)..." I guess, a special device is needed. The size of such device will be in thousands of mobile phones just in volume needed. Yet, it is feasible. ;)

wongarsu 3y ago
There wasn't much money in miniaturizing them so far. Cooling down tiny amounts of matter is much easier than cooling down larger amounts, so maybe there's hope for a microchip sized BEC in 20 years.
- ClumsyPilot 3y ago
  whats the smalled device to contain a gradient of 300 degrees C? this is a but solly, like saying you will eventually have a fridge the size if a m9bile phone - us it usefull?
- thesz 3y ago
  Let us take a look at what boson is. https://en.wikipedia.org/wiki/Boson https://en.wikipedia.org/wiki/Boson "multiple identical composite bosons (in this context sometimes known as 'bose particles') behave at high densities or low temperatures in a characteristic manner described by Bose–Einstein statistics: for example a gas of helium-4 atoms becomes a superfluid at temperatures close to absolute zero." Helium leaks as nothing else, even more than hydrogen. Here's some leak rates of heilum: https://www.researchgate.net/figure/Comparison-of-the-helium-leak-rate-for-samples-with-different-bonding-materials_fig4_262953618 https://www.researchgate.net/figure/Comparison-of-the-helium... Let's say we have a um^3 of helium in the device proposed. Let's assume leak rate of 8*10^-9 of cm^3/sec. (1e-6/1e-2)^3/(8e-9) is equal to 1.2499999999999998e-4 - all helium will leak in 1/8 of microsecond in the device proposed. I hope this helps.

jubjubbird 3y ago

The MEMS accelerometers in our phones are in theory sensitive to gravity changes, but they're not nearly sensitive enough. This group is trying to improve the MEMS sensing technology, but it's doubtful it will be as good as classical gravity meters (falling mass, or spring) or quantum (BEC) ones: https://www.gla.ac.uk/research/beacons/nanoquantum/wee-gglasgowsgravimeter/ https://www.gla.ac.uk/research/beacons/nanoquantum/wee-gglas... One important distinction is between measuring gravity (generally, acceleration in the vertical direction) and the gravity gradient. The latter is generally easier and more useful for navigation.