In thermal death time curve, after plotting C/t values from it, C value should be equal to Co value. When Co value versus process time in minutes is plotted on a linear graph paper, a straight line is obtained.

C/t represents the lethal rate at T.

All of the mentioned is true.

The rate of destruction of an organism per minute at any given temperature in a process is the reciprocal of the time in minutes.

Both of the mentioned are important factors on which safe processing schedule depends upon.

All of the mentioned is required for calculation of process time by Ball’s method.

Ball has established that 42% of the CUT is reusable in terms of the processing temperature. CUT is 10 minutes. Hence 4.2 minutes is deducted. Hence, when a CUT is 10 minutes and the calculated process was 60 minutes at 116 deg C, then the corrected process time is 55.8 minutes.

t/C that is the time taken to destroy the organism at temperature T when C=1 is read from the graph. C and z are known. C/t is then calculated as reciprocal.

By plotting the C/t values obtained from a thermal death time curve, a curve is obtained. The lethal value is obtained by the area under the curve.

With respect to thermal death time curve, D value is the unit defined as the combination of time and temperature to bring about a 90% reduction in spoilage organisms.