ONE FORMULA, ONE ANSWER
Bond Number Calculator
Calculate the magnitude ratio of gravity due to the density difference between two fluids to interfacial tension. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Bond number Bo
Enter values and select Calculate.
Bo = |ρ₁ − ρ₂|gL² / σ
Assumptions
Required: two immiscible fluids with constant densities and interfacial tension. The result is a nonnegative magnitude using the absolute density difference. Excluded: deciding interface stability or shape from fluid ordering and Bo alone.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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