why are first bubbles allowed to escape

A liquid (water), having boiling point about 20 to 30C higher than that of the given liquid (whose molecular mass is to be determined) is poured into the outer jacket so as to fill its bulb up to one-third its capacity. Cleaned and dried Victor Meyer's tube is suspended into the outer copper jacke..

. These caps allow the lighter vapors to escape up the column while the progressively less volatile and heavier fraction condense and flow into the respective trays (through tray holes and overflow) in the lower section of the tower. They can then be tapped out. The major produc..

Increase in temperature, decreases the solubility of a solute. On heating, the gases dissolved in milk escape making the milk bubble and boil ove..

Vapour pressure measures the tendency for the molecules to escape from liquid to the gas phase. At lower temperatures the vapour pressure of a liquid is much lower than the pressure on the surface of the liquid. When the temperature of the liquid is gradually increased, its vapour p..

Blast furnace is a cylindrical furnace made by refractory bricks surrounded by a steel shell. Blast Furnace Height of the furnace: 60-100ft Base of the furnace: 30-35 ft Double cup and cone arrangement It allows the entry of charge into furnace but does not allow any gas to ..

When wood is heated strongly in a very limited supply of air, wood charcoal is obtained. This is called destructive distillation of wood. The volatile products are allowed to escape. Charcoal is a black, porous and brittle solid. It is a good adsorbent. Charcoal powder adsorbs ..

Boiling - Vapour pressure measures the tendency for the molecules to escape from liquid to the gas phase. At lower temperatures the vapour pressure of a liquid is much lower than the pressure on the surface of the liquid. When the temperature of the liquid is gradually increased, its vapo..

Impure sulphur is heated in an iron retort. The sulphur vapors formed at 444 o C are allowed to escape in a large brick chamber. The vapors condense and form 'flowers of sulphur' on the walls of the chamber. After sometime when the temperature of the chamber rises up to 120 o C..

NO 2 is allowed to enter the absorption tower from the lower end. The tower is packed with quartz pieces and water is sprinkled from the top. Here, NO 2 is absorbed into water in the presence of air to yield nitric acid...