The defining equation for calorimetry is

Q=m.c.ΔT

Explanation:

Calorimetry is the part of physics that studies the phenomena related to thermal energy exchanges. This energy in transit is called heat and occurs due to the temperature difference between the bodies.

Calorimetry can be defined by the equation: Q = m.c.ΔT

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."