Terminologies


Carbon Neutrality (Net-Zero) the state of not emitting Carbon Dioxide or in other words, not adding to the total amount of greenhouse gases released into the atmosphere.
Carbon-capture the process of capturing Carbon Dioxide (CO₂) released into the environment.
Drag Count A drag count is a single unit of drag as defined by aerospace engineers. Drag is generally computed using the equation: $\frac{1}{2} \rho v^2 C_d s$ Where: $ρ$ is the air density $v$ is the current airspeed $C d$ is the drag coefficient (a dimensionless constant, usually on the order of 0.02 to 0.04 for an aircraft in cruise) $s$ is the aircraft wing area A drag count is 1/10000 of a $C d$ . So if, for example, the steady state drag coefficient is 0.0200 and someone sticks a hand out the window adding 5 drag counts, the new drag coefficient would be: 0.0200 + 0.0005 = 0.0205 or 205 drag counts. Drag count is used as a crude measure for the change in drag coefficient (it is not a direct measure of drag as it is associated with a reference area, it is only valid for use as a relative assessment of change).
Thermal hydraulics (also called thermohydraulics) is the study of hydraulic flow in thermal fluids. The area can be mainly divided into three parts: thermodynamics, fluid mechanics, and heat transfer, but they are often closely linked to each other.