Gas laws 1662 Robert Boyle studied the relationship between volume and pressure of a gas of fixed amount at constant temperature. He observed that volume of a given mass of a gas is inversely proportional to its pressure at a constant temperature. Boyle's law, published in 1662, states that, at constant temperature, the product of the pressure and volume of a given mass of an ideal gas in a closed system is always constant. It can be verified experimentally using a pressure gauge and a variable volume container. It can also be derived from the kinetic theory of gases: if a container,
The miller who was a wizard, a cheat and a matchmaker The miller who was a wizard, a cheat and a matchmaker The miller who was a wizard, a cheat and a matchmaker (title in Russian "Мельник – колдун, обманщик и сват [Melnik – koldun, obmanshchik i svat]") – is a Russian ballad opera in three acts with a libretto by Alexander Ablesimov that premiered on . Its folksong-based music was long attributed to Yevstigney Fomin but is now considered to have been by Mikhail Sokolovsky, and others have contributed music to revivals. The music for the opera is nowadays agreed to be by Mikhail Sokolovsky, although for a century it