Experiment
noun, verbal noun
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!
じっけん
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.
これは科学の実験です。
This is a science experiment.
実験を行う時は、安全のために必ずヘルメットをして下さい。
When conducting an experiment, be sure to wear a helmet for safety.
これから、お母さんは何と言ったらお金をくれるのか、実験したいと思います。
Now, I'd like to try an experiment to see what I have to say to get my mother to give me money.