الوصف
Different materials affect sound waves differently. For example, helium atoms are less massive than air molecules and so at a given temperature, sound travels faster in helium than air. This is the reason when you inhale helium from a balloon; the pitch of your voice rises so dramatically.
The profile of the liquid surface is an important point to consider. If the profile is turbulent, it results in foam. The readings are deflected due to foaming.
Obstructions in tanks can cause multiple and false reflections, but nowadays, signal processing helps to ignore these problems. This issue can be eliminated up to a certain limit. However, Radar level transmitters can also be a solution to this issue.
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