Physics Calculators (Page 5)
Velocity, mechanics, energy, electricity and physics tools.
Capillary Number Calculator
Compute the capillary number Ca = μv/σ (viscous vs surface tension).
Stagnation Pressure Calculator
Enter static pressure, density and velocity to compute stagnation (total) pressure p₀=p+½ρv². Air p=101325 Pa, ρ=1.225, v=50 m/s → p₀≈102856 Pa. The basis of the Pitot tube.
Prandtl Number Calculator
Enter dynamic viscosity, specific heat and thermal conductivity to compute the Prandtl number Pr = μ·c_p/k.
Nusselt Number Calculator
Enter heat-transfer coefficient, characteristic length and thermal conductivity to compute the Nusselt number Nu = h·L/k.
Fourier's Law of Heat Conduction Calculator
Enter thermal conductivity, area, temperature difference and thickness to compute the conductive heat rate q = k·A·ΔT/L.
Stefan-Boltzmann Law Calculator
Enter emissivity ε, area A and absolute temperature T to compute radiated power P=ε·σ·A·T⁴. ε=0.9, A=1 m², T=300 K → P≈413 W. T in Kelvin.
Thermal Diffusivity Calculator
Enter thermal conductivity, density and specific heat to compute thermal diffusivity α=k/(ρ·c_p). Water k=0.6, ρ=1000, c_p=4182 → α≈1.435e-7 m²/s; copper ≈1.1e-4 (≈800× faster).
Grashof Number Calculator
Compute the Grashof number Gr = gβΔTL³/ν² (buoyancy vs viscosity).
Rayleigh Number Calculator
Enter Grashof and Prandtl numbers to compute Rayleigh number Ra=Gr·Pr=g·β·ΔT·L³/(ν·α). Air: Gr≈2.65×10⁶, Pr≈0.7 → Ra≈1.86×10⁶ (laminar natural convection).
Schmidt Number Calculator
Enter kinematic viscosity and mass diffusivity to compute the Schmidt number Sc=ν/D. Air-water vapour ν=1.57e-5, D=2.5e-5 → Sc≈0.63; water-CO₂ ν=1e-6, D=1.9e-9 → Sc≈526.
Lewis Number Calculator
Enter thermal and mass diffusivities to compute the Lewis number Le = α/D (ratio of thermal to mass diffusion).
Biot Number Calculator
Compute the Biot number Bi = h·L/k for heat transfer.