Guideline of Physical Units and Symbols

Density or mass concentration—— ρ /  (ng · L^-1)

Concentration—— c / (mol · L^-1)

Mass—— m / g

Enzyme activity or virus DNA——z /  (U · mL^-1)

Length——l / m (or cm, mm,μm...)

Radius——d / m (or cm, mm,μm...)

Time——t / h (or min, s...)

Volume—— V / mL (or L)

Temperature—— T / ℃

Mass fraction or volume fraction / % (unit: 1)

Centrifuge speed—— ×g, if using revolutions per minute (r/min), the size of the centrifugal radius needs to be indicated.