Identify Problem and Understand T&P Valve Function

What happens here

The video introduces the problem: a blown temperature and pressure (T&P) relief valve on a gas water heater, which caused water to leak all over the floor. The suspected cause is that the water heater's thermostat dial was accidentally bumped to a very high setting, leading to excessive heat and pressure. The T&P valve is designed to release pressure if it exceeds 150 PSI or the temperature reaches over 210°F. The video proceeds to address this issue by preparing to replace the valve.

Goal: Understand the cause of the T&P valve failure and its safety function.