The pressure-volume (P-V) relation of Zr41Ti14Cu12.5Ni10Be22.5 bulk metalli
c glass (BMG) at room tem perature has been studied using a piston-cylinder
high-pressure apparatus up to 4.5 GPa. The equation of state of the BMG is
determined. As the first equation of state of the BMG, it is compared with
other crystalline solids, and the differences are phenomenologically expla
ined. The experimental results indicate the BMG contains a large amount of
vacancylike free volume.