A new report explains why many Americans can't afford the average new car. Mar 16, 2014 at 3:30PM. Ford's F-150 is America's best-selling new vehicle. But at an average transaction price of close to $40,000, it's out of reach of many American households -- or should be, says a new report.
How to Calculate Leaf Surface Area. The rate of transpiration is measured as the amount of water lost/ square meter/ minute. Because water evaporates through the many stomata on the leaf surface, the rate of transpiration is directly related to the surface area. To arrive at the rate of transpiration, therefore, you must calculate the leaf surface area of each plant: Because most stomata are found in the lower epidermis, you will determine that surface area. 1  Lay the leaves to be measured on a 1-cm grid and trace their outlines. 2  Count the number of square centimeters.
A pore, the stoma, lies between these cells, and allows gases to pass into and out of the leaf. This includes the carbon dioxide needed for photosynthesis, the oxygen it produces in the light-dependent reactions, and escaping water vapor resulting from transpiration.