відносна маса; відносна вага (палива тощо)
reduction ratio / gear ratio
Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio
jam to signal ratio (J/S ratio)
virtual mass / additional mass
aspect ratio
fighter-to-administrative personnel ratio
high expansion-ratio
power-to-weight ratio
signal-to-noise ratio (SNR; S/N)
thrust-to-weight ratio
damping ratio
attenuation ratio
base pressure ratio
weight-horsepower ratio
weight-strength ratio
depression ratio
explosion ratio
infantry-armor ratio
forward gear ratio
fuel-air ratio
fuselage fineness ratio
compression ratio
engine pressure ratio (EPR)
excess air ratio
fuel hydrogen / carbon ratio
hub-tip ratio
mixture ratio
pressure ratio
pressure ratio controller
space-chord ratio (of turbomachine cascade)
stage reaction ratio
California bearing ratio (CBR / C.B.R.)