Determine the total surface area of the leaves in cm 2 and record the value. Stepâ 2 Calculate the rate of transpiration/surface area. If you are using a gas pressure sensor to collect data, you can express these rate values as kPa/min/cm 2, where kPa (kilopascal) is a unit of pressure.Record the rate.etermine the total surface area of the leaves in cm 2 and record the value. Stepâ 2 Calculate the rate of transpiration/surface area. If you are using a gas pressure sensor to collect data, you can express these rate values as kPa/min/cm 2, where kPa (kilopascal) is a unit of pressure.
That's why cellphones are much more sophisticatedâand work in a completely different way. A cellphone handset contains a radio transmitter, for sending radio signals onward from the phone, and a radio receiver, for receiving incoming signals from other phones.
Bluetooth, Wi-Fi, and GPS are some of the biggest battery killers on cell phones, because they are constantly looking for possible connections, networks, or information. Turn off these features (look in your phone's settings) except when you need them to save power.luetooth, Wi-Fi, and GPS are some of the biggest battery killers on cell phones, because they are constantly looking for possible connections, networks, or information. Turn off these features (look in your phone's settings) except when you need them to save power.