From: steveo@eircom.net   
      
   On Tue, 26 Mar 2024 17:33:50 +0000   
   Jim H  wrote:   
      
   > Assuming the "oil" you're talking about is kerosene/heating fuel, the   
   > speed of sound is 1330 m/sec so 0.5cm takes 3.76 micro-sec.   
      
   	I would have thought it's measuring the distance to the surface of   
   the oil from above the oil so it would be the speed of sound in air that   
   matters 300m/s.   
      
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   Steve O'Hara-Smith   
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