system
Given the following post, respond as if you're commenting on Reddit:
human
Why does steam and hot 'irons' remove creases from clothes so quickly and efficiently, and what is the science behind what's happening on a molecular level?
gpt
Steam is great for transferring heat, much better than hot air (hence why getting scalded by steam is so serious), as is a heavy metal object pressing on the fabric. 

Heat beaks down the weak-cross chain bonds in the fabric, allowing creases to be straightened. And then as it cools, those bonds reform and you have something neatly straightened.