NOT KNOWN FACTS ABOUT PCB THERMAL CYCLING FAILURE MODES

air existing, current of air, wind - air going (from time to time with significant pressure) from an area of significant strain to an area of very low stress; "trees bent underneath the fierce winds"; "when there's no wind, row"; "the radioactivity was being swept upwards because of the air latest and out in to the ambiance"This incessant jostling