The second.
velocity.
The SI unit of time is the second (s), which is defined based on the vibrational frequency of the cesium atom in atomic clocks. It is used as the base unit for measuring time intervals in various scientific and everyday applications.
Anything from the Metric Sysytem would be what you call a "scientific unit"
The scientific unit for electric current is the ampere.
The scientific unit used for pressure is the pascal (Pa).
Split second is a turn of phrase, not a scientific unit.
The scientific definition of pace is the speed or rate at which something happens, changes, or develops
Kilogram.
cm3
The standard period unit used in scientific research studies is typically the second.
It is kilogram
Power is defined as energy per unit time. You can also say 'rate of doing work'.