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Ultrasonic2

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I have searched the net and this forum and i have found some formula but I am to thick to work it out even with an equation.

https://www.physicsforums.com/showthread.php?t=117105

This isn't home work as i haven't been to school for a long time now .. probably if i was at school i could have understood peoples replies

Basically what i want to know is for a 100mph wind what is that in psi ?

i obviously want to be able to change the mph and see the result in psi is but i need REAL basic maths.

From what I've read so far it's important to know I am at sea level

Please help.

Thanks for your help in advance Michael D