The relationship between the pressure and volume of a fixed mass of a gas at constant temperature is called __________.May 2, 2019 AdminIn Academics Mcqs, Chemistry McqsLeave a Comment on The relationship between the pressure and volume of a fixed mass of a gas at constant temperature is called __________. A. Boyle’s law B. Charles’s law C. Avogadro’s law D. All of these Posts Tagged with… Boyle's law, Chemistry