Definition: A test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

Alright class, settle down, let’s take a look! Today we’re tackling “experiments,” a word that sounds quite grand. Let's break it down with a little hand! The dictionary gave us a really helpful clue, you see – it’s more than just playing carelessly! It says an experiment is like this: a test, precise and bright, done under conditions, shining light. Think of it like this, my clever students dear: We want to prove something, or maybe make it clear. Perhaps we've got a theory, a thought we hold so true, And an experiment helps us see if it’s actually new! Let’s unpack those parts – let’s really get it right: “Controlled conditions” - That means keeping things the same, you know? Like making sure only one thing changes, so we can watch it grow. It's about limiting what could cause a surprise! "Demonstrate a known truth" – We’re showing something that already seems to be true! Like confirming a fact, shiny and new. “Examine the validity of a hypothesis” - A hypothesis is just a guess, a hopeful plea! An experiment helps us see if our guess is really free... of flaws or errors, a test for what's believed, to prove it’s worthy, cleverly achieved. “Determine the efficacy of something previously untried” – This means we're trying something new, a concept yet unknown! To check if it works well, and if it can be shown. Essentially, an experiment is about learning through doing, you see? It’s about careful planning and observation, carefully! Do you have any questions about this, class? Don't be shy, let's discuss!