Engineering Formula Quick Sheet

QUESTRA — Engineering Formula Quick Sheet
Original introductory resource
Continuity (steady incompressible flow): A1 v1 = A2 v2
Reynolds number: Re = rho v D / mu
Plane-wall heat conduction: Q = k A (T1-T2) / L
Ideal gas: P V = n R T
Ohm law: V = I R
Power (electrical DC): P = V I
Normal stress: sigma = F / A
Use consistent SI units. Check the assumptions before applying each formula.