![...between the number of chirps per
minute and the ambient temperature.
...between the number of chirps per
minute and the ambient temperature.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
...between the number of chirps PER
minute and the ambient temPERature.
The Big Bang Theory Season 3, Episode 2
![We're melting 52 ingots per hour.
We're melting 52 ingots per hour.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
We're melting 52 ingots PER hour.
Money Heist Season 3, Episode 5
![of 4.6 yoctometers
per femtosecond.
of 4.6 yoctometers
per femtosecond.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
of 4.6 yoctometers
PER femtosecond.
The Big Bang Theory Season 5, Episode 18
![has to be four revolutions per second.
has to be four revolutions per second.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
has to be four revolutions PER second.
The Big Bang Theory Season 10, Episode 20
![show a part per
million deviation.
show a part per
million deviation.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
show a part PER
million deviation.
The Big Bang Theory Season 12, Episode 18