In this lab you will be investigating the effects of different environmental factors on the rate of transpiration in a plant. You will be using a. potometer. (a pipette attached to a rubber tube) to measure the rate of water loss in a plant.n this lab you will be investigating the effects of different environmental factors on the rate of transpiration in a plant. You will be using a. potometer. (a pipette attached to a rubber tube) to measure the rate of water loss in a plant.
The carâs radiator acts as a heat exchanger, transferring excess heat from the engineâs coolant fluid into the air. The radiator is composed of tubes that carry the coolant fluid, a protective cap thatâs actually a pressure valve and a tank on each side to catch the coolant fluid overflow.
Most of the coolant that is forced into the expansion tank returns to the radiator naturally after a few hours or when the engine is cold. If you had no expansion tank on your car, then the coolant that was released under pressure would spill out onto the road.hen the pressure builds to a high enough point, the radiatior cap allows that pressure to escape into the coolant reservoir through a small black rubber tube, called an overflow tube connected by the neck of the radiator to the expansion tank.