Go out for a night drive and most cars’ headlights are kind of yellow but a few luxury models will have a dazzling blue-white light. That’s the color of xenon gas as it glows when an ungodly amount of heat, pressure and electricity come together in its presence.
This heavy (for a gas) element has another cool trick up its sleeve. Inside a pressurized ampule such as this one it will turn into a liquid when chilled below 16°C (50°F). Hold it in your hands for few seconds as it heats back up past this point and the liquid inside vanishes before your eyes back to its gaseous state!