4 ms·
you can measure negative pressure, negative acceleration
by asddubs 3y ago
you can measure negative pressure, negative acceleration
- ndsipa_pomu 3y agoNegative pressure is usually a comparison with e.g. atmospheric pressure, so I wouldn't consider it a simple measurement. An actual negative pressure would presumably be less empty than a vacuum e.g. the Casimir effect. Negative acceleration has a directional component, so again, it's like a negative velocity and is a vector.
- ksaj 3y agoI've read articles about negative Kelvin where they surmise it would get hotter. Keeping in mind what heat actually is, the atoms would just be out of phase.
- ndsipa_pomu 3y agoYes, temperatures below absolute zero are possible and have been achieved (something to do with flipping the high and low energy states), but I stand by my comment that it isn't easy to measure and definitely a far more advanced concept for kids than negative numbers. https://en.wikipedia.org/wiki/Negative_temperature https://en.wikipedia.org/wiki/Negative_temperature