(Via @EdDriscoll) Newton’s Third Law: For every action there is an equal, and opposite reaction.
— Ben Chapman (@benjaminchapman) August 28, 2015
In this case, when the lid of the pressure cooker/canner decided to attempt to reach escape velocity the actual cooker/canner itself was pushed down. And it turns out that the stove’s surface did not have the structural integrity to withstand that particular sudden application of force. Which is why they say…
Although admittedly they’re talking about Newton’s First Law, there.