We cover why the torch tip you grab off your van matters more than you think — from the difference between a #0 and a rosebud, to how BTUs (not just flame temperature) determine how much heat energy is actually going into your copper. Spoiler: that rosebud is putting out 22,000–44,000 BTUs. That’s like holding a 4-ton AC unit in your hand applying heat to a pipe.

We also dive into the science of acetylene tanks — how acetone stores the gas, why the one-seventh rule exists, what a garlic smell or green flame really means, and why tank orientation is a safety issue, not just a preference.

The science behind proper torch use is something the HVAC industry doesn’t talk about enough. Whether you’re new to brazing or a seasoned pro, this one’s worth your time.