The term that best completes the statement above would be "aria." It is a part of the opera wherein it expresses the music of the ensemble in such a way that it dictates the tone of the opera. It is usually accompanied by an instrument and it is not necessarily song by the opera singer.
Answer:
length is L
mass is g
temp. is C or K
volume is s
time is m
Explanation:
m is for minutes prolly
g is for grams which relates to mass prolly
L prolly just stands for length
C as in celsius and K as in kelvin which is a scientific temperature measurement
and then volume is s because its the only one left