What is serial dilution?
Serial dilution creates a geometrically decreasing series of concentrations by repeatedly diluting a solution by a constant factor. Each step dilutes the previous tube.
Cn = C₀ / (Dilution Factor)ⁿ
Common dilution factors: 1:10, 1:2, 1:5. Used in microbiology for plate counts, ELISA, and antibody titration.