Um, propane is a liquid- it’s formal name is Liquified Petroleum Gas (LPG).
Based on the video of that imgur gif (there was a youtube video of it that I saw some years ago) and the way it went up, I’m guessing that was a propane cylinder that some chucklehead thought was junk, and didn’t bother following normal protocols to ensure it was safe before using a torch to cut it open (which is why it burst into flames). when he kicked it, he sloshed around the liquid that was in the tank and rolled it around for the liquid to better escape, which is why it turned into a conflagration and destroyed a (probably expensive) excavator.
The idiot is extremely lucky he wasn’t killed. Hopefully he learned from the experience.
