It's a recording of water boiling in a kettle.
You can hear the electric gas ignitor, the ignition and then warming up.
The water was already very hot so this wouldn't take forever to boil.
Then the whistley does it's job.
Rising, steady, then the gas was taken out and the whistle slowly fades away.
Very long natural fade-out.
Recorded with Zoom H2.
Edited and normalized with Audacity.
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