Spring constant of the latex tubing

[martin417]

I have done my due diligence by searching CD, and was surprised not to find an answer to this question:

Has anyone empirically determined the spring constant for the latex tubing supplied in the KOP? I could do it, but I don't have access to the kit at the moment, and was curious.

Obviously, the value would have to be given for a fixed unstretched length, say 1 foot, but it should scale linearly. And it will change depending on age, temperature, humidity, etc, but a ball park figure should be good enough.

If no one has the answer, I will have the students perform an experiment, and report the results here.