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seen May 20 at 6:30

May
20
comment Is it possible to build an air compressor with no moving parts?
@fibonatic: Scratch piezoelectricity. It requires very little movement (as much as the compressed crystal yields), but still. OTOH, add nuclear thermoelectric - RTG batteries, electrochemical (standard batteries), pyroelectric, electromagnetic with magnetic field affected by Curie temperature, or capturing electromagnetic waves (big antenna, "detector radio"), and possibly a few more. And all of the driving circuitry can be solid-state, there are even oscillators that don't use vibrating quartz.
Apr
20
asked Speed of pressurized gas escaping into vacuum
Mar
24
awarded  Yearling
Mar
22
accepted Tsunami effects of a nuclear explosion
Mar
22
comment Tsunami effects of a nuclear explosion
(in case this question is deemed off-topic, could you point me to the right place to ask it?)
Mar
22
asked Tsunami effects of a nuclear explosion
Feb
5
accepted Dangerous dose of I-131?
Feb
5
comment Why doesn't oxyhydrogen flame travel through a narrow pipe?
@tpg2114: Of course not a subject for the comments, but definitely a fascinating subject for a new question to post. Would you help me with phrasing it? "What factors decide whether oxygen-fuel mix creates a flame front or explosion?" (explaining in the body of question I mean factors that lead to flame front coupling with the shockwave, not just the one simple factor of the flame moving at supersonic speed. I'd give oxyhydrogen mix and air-fuel bombs as two examples of the opposite effects in atmospheric conditions.) - would such question be right?
Feb
5
comment Why doesn't oxyhydrogen flame travel through a narrow pipe?
Well, thanks for clarification, flame front vs explosion etc, and that's quite satisfactory to me.
Feb
5
accepted Why doesn't oxyhydrogen flame travel through a narrow pipe?
Feb
5
comment Why doesn't oxyhydrogen flame travel through a narrow pipe?
In one hand, yes, gas speed in the needle can be pretty high, on the other hand, oxyhydrogen is an explosive mix, so the propagation speed is more than "a few meters per second", so I'll wait for some more voices to confirm. (OTOH, I believe it's possible the oxygen content in the mix may be lower, some of oxygen lost to oxidation of the electrodes in the generator.)
Feb
5
asked Why doesn't oxyhydrogen flame travel through a narrow pipe?
Nov
21
comment How to convert cc to bar?
@DavePhD: A misnomer... temperature at which ice ceases to be ice (whatever it turns into).
Nov
21
accepted How to convert cc to bar?
Nov
21
asked How to convert cc to bar?
Nov
17
comment How does aerogel attain its enormous heat isolation properties?
...so, in void, convection and conduction become nearly non-issue; how would it fare against radiation?
Nov
17
revised How does aerogel attain its enormous heat isolation properties?
added 21 characters in body
Nov
17
asked How does aerogel attain its enormous heat isolation properties?
Oct
15
awarded  Nice Question
Sep
11
awarded  Notable Question