Definition: A fuel derived from petroleum (or other oils) but heavier than gasoline/petrol. Used to power diesel engines which burn this fuel using the heat produced when air is compressed.

Alright class, settle down now, let’s dive in with a bow! Today we're tackling “diesel,” it’s quite a word, you see, Let's break it down for you, so clearly and free. The dictionary tells us, with facts precise and neat, “Diesel” is a fuel , a powerful treat! It comes from oil – petroleum’s flow, Heavier than gasoline, watch its energy grow! (Think of it like this, if you please, Like molasses thick, compared to breezy ease!) Now these fuels are used in engines strong and true, Diesel engines burn them, a remarkable view. But how do they burn? It's a clever design! They squeeze the air tight, a compression divine. This squeezing creates heat, you understand, And that heat ignites the fuel, across the land! So remember this lesson, don’t you despair, “Diesel” means a heavy fuel, with power to share! Do you have any questions for me? Let's discuss with glee!