C4 pathway A pathway of carbon fixation, found most commonly in tropical plants that have high rates of growth and photosynthesis and that are adapted to high temperatures, strong light, low carbon dioxide levels, and low water supply. Its importance lies mainly in its reduction of photorespiration.
PT 100 RTD means Resistance temperature detector(RTD) of platinum with 100 ohms resistance at zero degree centigrade.
RTD is the acronym for Resistance Temperature Detector. It has a positive value of temperature coefficient. Hence the resistance at temperature T can be expressed as a function of resistance at temperature 0, and temperature co-efficient. [math]{\alpha}[/math] is the temperature coefficient of resistance.