Reflow/ˈriːfləʊ/ Definition 1 of 2Pro Tip 1/3Physical Change Reflow involves heating until a material becomes liquid without changing its properties. The artisan reflowed the silver without altering its purity. Pro Tip 2/3Industrial Processes Reflow is common in industries that recycle or reshape metals and similar materials. The factory reflows scrap metal for making new car parts. Pro Tip 3/3Heat Application Using 'reflow' suggests a precise, controlled heating process. He reflowed the solder to fix the circuit board connections.