At a constant temperature, a syringe containing 20.0 milliliters of air at 1 atmosphere of pressure is pulled out so that the volume inside the syringe is increased to 40.0 milliliters. The total pressure of the gases inside the syringe decreases to approximately 0.5 atmospheres. Which of the following best explains this observation?

W) Gay-Lussac's Law

X) Charles's Law

Y) Boyle's Law

Z) Avogadro's Law
Y) BOYLE'S LAW