Like the speed of sound and the height of the table where the experiment is.
Note that the pressure of the air changes with height. For a few inches the change is negligible and very difficult (impossible?) to measure, but the effect must be out there.
I had once a problem with the temperature of the room, you usually ignore it, but it has a bigger effect like a 5% variation.
Note that the pressure of the air changes with height. For a few inches the change is negligible and very difficult (impossible?) to measure, but the effect must be out there.
I had once a problem with the temperature of the room, you usually ignore it, but it has a bigger effect like a 5% variation.