Home science: boil water with a syringe @melchemistry7035

Uploaded June 2021 | Updated September 2026, 3 weeks ago

Boil water without a kettle!

Equipment: glass bottle, rubber stopper with one hole, syringe.
Insert a syringe into a rubber stopper with one hole. Pour some hot water into a glass bottle, plug the neck with the stopper, and pull out the syringe plunger – the water boils!

As you pull the plunger on the syringe, the pressure inside the bottle decreases, and the boiling point of the water decreases with it. A similar phenomenon can be observed in the mountains: due to the increase in elevation, atmospheric pressure decreases, and with it, the boiling point of water. For example, on the summit of Everest, water boils at 69 °C (156.2 °F)!

Many more cool experiments are waiting for you in the MEL Physics subscription!

Warning! Only under adult supervision.

$Eternal radiance of inert gases Introduction These elements belong to the eighth group of the Periodic Table, and possess stable, full electron shells. Inert gases, or noble gases, are monatomic gases with no color or smell. They glow brightly when current flows through them. They also liquefy and freeze at significantly lower temperatures than other gases. Helium is the lightest among them, followed by neon, argon, krypton, xenon, and radon. History of discovery The first inert gas in the periodic system and the first to be discovered was helium. It was observed for the first time by Jules Janssen in 1868 during a total solar eclipse. A quarter of a century later, Lord Rayleigh and William Ramsay isolated a new element they called argon. In 1898, William Ramsay and Morris Travers discovered krypton, xenon, and neon. In 1904, Rayleigh and Ramsay received Nobel Prizes in Physics and Chemistry, respectively, for their discoveries and studies on this topic. Extraction and chemical properties Neon, argon, krypton, and xenon are extracted from the air. First, the air is purified of carbon dioxide and moisture and compressed via deep freeze. Next, the liquid air is gradually evaporated by a number of fractional distillations. These four gases are separated during this process using different technical solutions. Helium is obtained via a similar method, but from natural gas. Inert gases are practically chemically inactive due to peculiarities in their electron shell structure: their atoms have full valence electron shells. Valence electrons are an atom’s outer electrons, and are usually the only electrons involved in chemical bonding. However, heavier noble gases, due to the increased distance of the valence electrons from the nucleus, are capable of entering into chemical bonds with strong oxidants such as fluorine and oxygen. Applications Inert gases have a wide variety of uses. Helium is incorporated in the composition of gas mixtures used in scuba diving and to fill balloons. It can also temporarily affect the pitch of the voice if inhaled. Neon is mainly used to fill aptly-named neon signs and, in liquid form, as a coolant. Argon is used in plasma cutting and some surgical procedures. Krypton is used to fuel SpaceX satellites’ electric propulsion systems and manufacture lasers. Xenon is mainly utilized in IMAX film projection systems and as a contrast agent in CT and MRI scans.$