Abstract: A mixing apparatus having a mixing chamber which has inlet ports of resin components to be mixed and an outlet port of a mixture thus obtained, comprising a flow varying member which moves across the mixing chamber to selectively occupy a retracted position in which it is retracted from the mixing chamber and a forward position in which the flow varying member interrupts the flow of the resin components to change the directions thereof, an immovable key member which defines a restriction passage together with the flow varying member which occupies the forward position, and a chamber block which is opposed to the flow varying member to laterally move in order to selectively occupy a forward position in which it defines a part of the mixing chamber and a retracted position in which the chamber block defines a flow varying chamber together with the key member and the flow varying member which occupies the forward position.

Abstract: A method for measuring the amount of the gas contained in liquid, comprising introducing a liquid material into a vacuum measuring chamber, changing the volume of the measuring chamber to provide two different liquid pressures of the liquid material in the measuring chamber, detecting the different pressures to measure the amount of gas on the basis of Boyle's law.