Meaning of the word "controlled experiment" in English

What does "controlled experiment" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

controlled experiment

US /kənˈtroʊld ɪkˈsper.ə.mənt/
UK /kənˈtrəʊld ɪkˈsper.ɪ.mənt/
"controlled experiment" picture

Noun

a scientific test in which all conditions are kept constant except for the variable being tested

Example:
The researchers conducted a controlled experiment to test the new drug's efficacy.
In a controlled experiment, only one factor is changed at a time.