I borrowed a car for an experiment.
We experimented to find out what things we could say to make Viet angry.
Who wants to be a guinea pig for the experiment for our new fugu flavored tofu project?
A test that tries to find truth is an experiment. This is because you don't know the truth, so the only way to find it is to try things out and test them. Thus, experiment!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Take note that the つ in じつ is turned into a small っ, though.