04-21-2020, 01:56 PM
Thank you for these interesting articles !
There is some strange behaviour with your test tube indeed !
I try some experiments with mine. I put it in the oven few minutes and i found a frequency of 515.63 Hz for a measured air temperature inside the tube of 65°C. This gives a speed of 370.37 m/s. It seems to be a pretty good result.
Then i tried with the test tube in the freezer for a few minutes. With a measured air température of -5°C i found a frequency of 468.75 Hz. Exactly the same as in the room temperature of about 20°C.
Strange !!!
There is some strange behaviour with your test tube indeed !
I try some experiments with mine. I put it in the oven few minutes and i found a frequency of 515.63 Hz for a measured air temperature inside the tube of 65°C. This gives a speed of 370.37 m/s. It seems to be a pretty good result.
Then i tried with the test tube in the freezer for a few minutes. With a measured air température of -5°C i found a frequency of 468.75 Hz. Exactly the same as in the room temperature of about 20°C.
Strange !!!