Rubber Ball Specs
A mathmatician, a physicist, and an engineer were all given a red rubber ball and told to find the volume.
The mathmatician carefully measured the diameter and evaluated a triple integral.
The physicist filled a beaker with water, put the ball in the water, and measured the total displacement.
The engineer looked up the model and serial numbers in his red-rubber-ball table.
A chemist walks into a pharmacy and asks the pharmacist, "Do you have any acetylsalicylic acid?"
"You mean aspirin?" asked the pharmacist.
"That's it, I can never remember that word."
Physics vs. Math
A physics professor has been doing an experiment, and has worked out an emphirical equation that seems to explain his data. He asks the math professor to look at it.
A week later, the math professor says the equation is invalid. By then, the physics professor has used his equation to predict the results of further experiments, and he is getting excellent results, so he asks the math professor to look again.
Another week goes by, and they meet once more. The math professor tells the physics professor the equation does work, "But only in the trivial case where the numbers are real and positive."