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.
Leaf surfaces are equipped with stomata. These allow carbon dioxide to enter the leaf and oxygen to escape to facilitate photosynthesis. In addition, it helps to regulate water loss during a process called transpiration. Above 95- 99% of the water absorbed by roots of a plant is lost by the leaves through transpiration.he number of stomata per unit area on the leaf surfaces of Cleome species with the stomatal indices have been recorded in Table 1 and nature and type of stomata have been shown in Fig 1. Stomata are pores on leaf surfaces through which plants exchange C02, water vapor, and other constituents with the atmosphere.