Question

If u hv a dense laboratory culture of bacteria in a petri dish what is the best measure to report its density

Answer 1

For calculating the density of bacteria. The dense solution has to be diluted for at least 100x. this makes the calculation a lot more easy. The total number should be determined most appropriately to get the best result.  

Answer 2

The density of a laboratory bacterial culture can be measured with the help of a colony forming unit (CFU). Colony forming unit of a bacterial culture calculates the number of bacterial cells in a given culture medium.

This can be estimated by first counting the colonies on the plate and diluting a certain amount of the culture with a suitable dilution factor.

The final calculation is as follows:

$C F U=\frac{\text {Number of bacterial colonies } \times \text { Dilution factor }}{\text { Volume of the petri dish}}$

This tells us the number of bacteria present in the given petri plate culture.