Description
Multiply nonnegative oldDisplacement by newDensity / oldDensity and return that ratio.
Vessel draft, loading moments, and free-surface terms describe different parts of hydrostatic behavior. Their signs, reference positions, and dimensional bases must be stated before comparison.
Multiply nonnegative oldDisplacement by newDensity / oldDensity and return that ratio.
When to use this tool
Use Vessel Displacement Fresh Salt Density Factor when you need a supplied trim, loading, or hydrostatic component.
How to use the tool and how it works
- Enter oldDisplacement, oldDensity, newDensity. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read newDisplacement, ratio. Use the output convention below.
Multiply nonnegative oldDisplacement by newDensity / oldDensity and return that ratio. Both densities must be positive and share a unit.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| oldDisplacement | Nonnegative displacement mass at the original density, with displaced volume held fixed. | Required. Finite number; minimum 0. |
| oldDensity | Old Density | Required. Finite number; strictly above 0. |
| newDensity | New Density | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| newDisplacement | Displacement mass scaled to newDensity at fixed displaced volume. | Required. Finite number. |
| ratio | Dimensionless ratio when numerator and denominator use compatible units. | Required. Finite number. |
{
"input": {
"oldDisplacement": 1000,
"oldDensity": 1000,
"newDensity": 1025
},
"output": {
"newDisplacement": 1025,
"ratio": 1.025
}
}Limitations and assumptions
- This scales mass displacement for a fixed displaced volume; it does not solve the new draft of a fixed-mass vessel.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Consult vessel-specific hydrostatic and stability information under the relevant loading condition for a complete assessment.
References
Similar or alternative tools
- Ballast Tank Free Surface Correction Term
Multiply nonnegative liquidDensity by nonnegative freeSurfaceSecondMoment and divide by positive displacementMass for metacentricReduction.
- Nautical Draft Forward Aft Average
Average nonnegative forward and aft drafts for meanDraft and subtract forward from aft for trim.