Pregunta de Matemática e suas Tecnologias #01a0e94a

A pipe constantly discharges the same volume of water per unit time into a water tank, which means that the flow rate of water in this pipe is constant. At the junction between this pipe and the water tank, a filtration membrane is installed with the aim of filtering any impurities present in the water, combined with good water flow. The water flux ($\varphi$) through the surface of the membrane is directly proportional to the flow rate of water in the pipe, measured in milliliters per second, and inversely proportional to the surface area of the membrane, measured in square centimeters. The appropriate unit of measurement to describe the water flux ($\varphi$) passing through the surface of the membrane is