Hmmm @adamaero not sure that's true in all cases - take heating a steel bar to red-hot conditions. The fact that it is emitting infrared (and now visible light) means that some portion of the input energy is lost as light. So heating the bar using 1kJ of energy then dunking it in water will result in a lower water temp rise, than heating the water directly with 1kJ of energy.

I assumed the the thermoelectric generator heat flux equation was for idealistic conditions, certus paribus like.

Unrelated, how can a frequency be obtained for a sound that isn't periodic?

"Mass is particularly effective at reducing low frequency waves (think bass) though is less effective at high frequency (think treble)."

@rdtsc I think in that case you're not dealing with a fully-closed system to absorb the radiation

@adamaero FFT

Where you're looking at the spectrum of a signal, not expecting it to be a single frequency

Agreed @W5VO. "Trap for young players."

I'm thinking about soundproofing the insides of a closet (spans the wall) where a shower is on the other side. Looked into it a bit and saw that quote. Wondered

The single noise question was a tangent. It seems a shower generates low and high frequency sound. I wonder if a shower mat would reduce the (I'm guessing) higher frequency noise...

Bathroom tiles have excellent acoustics. The magic solution might be to hang up a bunch of towels and maybe a shower curtain in the bathroom. A rug on the floor etc.

@adamaero Get a sensor app for your phone, one with a FFT function. That will tell you the frequency content.

Check out this video about acoustic panels. TL;DR: not as easy as it might seem...

I once tried to get Acousto working to simulate an acoustic problem. Summary: never installed right, never worked.

Interesting stuff. Thanks ya'll