Stretch ratio is a big mouthful of words that means how much longer something can get before it breaks or snaps.
Think of a rubber band. When you pull a rubber band, it stretches longer before it snaps, right? The stretch ratio is simply how much you can stretch the rubber band before it gets too long and breaks.
The same thing applies to other materials like plastic, metal or fabric.
When people talk about stretch ratio, they are usually talking about materials being pulled in one direction. This means that if you pull a material a certain amount, it will get a little bit longer. But, if you keep pulling it harder, it will eventually get so long that it breaks. That's the stretch ratio.
Stretch ratio is important because it helps people know how much they can stretch a material before it becomes unsafe or unusable. For example, if you're making a bungee cord or a parachute, you need to know the stretch ratio of the materials you're using to make sure they're strong enough to hold people safely.
So, in a nutshell, the stretch ratio is all about how much you can stretch a material before it breaks. It's an important thing to know when making anything that needs to be strong and flexible at the same time.