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The Computer Controlled Gas Laws Unit (Boyle and Gay-Lussac Law), "TLBGC", allows to demonstrate two fundamental gas laws: Boylend Mariotte's Law (isothermal change of state) and Gay-Lussac's 2 Law (isochoric change of state). The unit consists of a rigid frame containing two transparent vessels, that enables to observe the change of state in the test gas (air). In the first vessel, for investigation of isochoric change of state, the temperature of the test gas is increased by a computer controlled electrical heating element, and the resulting pressure rise is measured. The volume of the enclosed gas remains constant. A valve at the bottom of the vessel allows students to normalize the air in the vessel to room conditions. In the second vessel, for investigation of isothermal change of state, students use a compressor/vacuum pump to increase or decrease the pressure in a reservoir vessel that moves a "liquid piston" of oil in the test vessel. This piston compresses or decompresses a trapped column of air in the test vessel. If the changes occur slowly, the change of state takes place at an almost constant temperature. Temperatures, pressures and level are measured by means of s