The heat current is written as `(DeltaQ)/(Deltat)` . Why don't we write `(dQ)/(dt)` ?

Why don't we drink sea water

How much pressure do we carry on our heads ? Why don't we feel it ?

When do we don't use filtration ?

What happens if we don’t have eyelashes?

A warning of high voltage is usually displayed instead of high current near an electrical equipment or transmission lines but it is actually the current that surges through a body in contact with the equipement . Why don't we rather use the warnings of high current ?

Assertion : Specific heat of any substance remains constant at all temperatures. Reason : It is given by s= 1/m * (dQ)/(dt) .