Determining the temperature with this!

In physics we used a tuning fork, pvc pipe, water and a ruler to determine the speed of sound in the room, and from there we determined the temperature.

We used the tube in water which acts as a closed end resonating air column.  We can extend the tube to find the first resonant length of the tube.  It really sounds loud at a specific length due to how the 256 Hz tuning fork excited the air column.