Standard test boards populated with common components including BGAs and QFPs were built with vapor phase and convection soldering technology and tested at Epic Technoligies, LLC facility. Reliability testing demonstrated that lead-free and tin-lead joints produced by vapor phase to be equally robust as those from convection reflow. The controllable, lower peak solder temperature makes vapor phase ideal for soldering complex assemblies having sensitive lead-free SMT components
Particulates, gases, and vapors are a hazardous substance and can put any person at great risk. Because of this reason, a person should wear appropriate safety eyewear along cloth and other safety gears if they are near to their working site.
Humidity is the level water vapor in the air, and we can't see it. When water turns into a gas, it becomes invisible to us. You must have heard of absolute humidity and relative humidity.