Elastic Moduli at a Glance
| Modulus | Deformation Type | Formula | Dimensional Formula | Unit |
|---|---|---|---|---|
| Young's (Y) | Linear (longitudinal) | Y = FL/(A) | [ ] | Pa |
| Bulk (B) | Volumetric | B = −V(dP/dV) | [ ] | Pa |
| Shear (G) | Tangential | G = τ/φ | [ ] | Pa |
Surface Tension: Drop vs Bubble vs Capillary
Liquid Drop $\Delta P$ = 2S/R 1 free surface ← 1 layer → Soap Bubble $\Delta P$ = 4S/R 2 free surfaces outer + inner Capillary h=2Scosθ/ρgr hHeat Transfer Comparison
| Mode | Law | Key Formula | K / σ Units |
|---|---|---|---|
| Conduction | Fourier's | Q/t = KA()/L | K: W |
| Convection | Newton's Cooling | dT/dt = −k(T − ) | k: |
| Radiation | Stefan-Boltzmann | P = σ | σ = W |