Pumice Density Floating Checker

Model pore-water uptake at fixed pumice envelope volume and report a signed neutral-buoyancy fill fraction; values outside [0,1] identify unreachable thresholds, not an invented flotation guarantee.

Description

Pumice can gain density when water enters connected pores.

Pumice can gain density when water enters connected pores. Neutral buoyancy occurs when its envelope-average density equals water density.

Model pore-water uptake at fixed pumice envelope volume and report a signed neutral-buoyancy fill fraction; values outside [0,1] identify unreachable thresholds, not an invented flotation guarantee.

When to use Pumice Density Floating Checker

Use this tool to model pore-water uptake at fixed pumice envelope volume and report a signed neutral-buoyancy fill fraction; values outside [0,1] identify unreachable thresholds, not an invented flotation guarantee.

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.

How to use Pumice Density Floating Checker and understand its results

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
Enter dryPumiceBulkDensityKgPerM3, waterDensityKgPerM3, connectedPoreVolumeFraction, waterFilledConnectedPoreFraction using the field table and calculation rules, then run the tool.
Read wettedBulkDensityKgPerM3, modelWaterFillFractionAtNeutralBuoyancy, positiveBuoyancyUnderModel. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
dryPumiceBulkDensityKgPerM3	Dry pumice bulk density kg per m3	number	Required
waterDensityKgPerM3	Water density kg per m3	number	Required
connectedPoreVolumeFraction	Connected pore volume fraction	number	Required
waterFilledConnectedPoreFraction	Water filled connected pore fraction	number	Required

Use positive densities and connected porosity in (0,1], with fill in [0,1]. Compute wet density, the fill needed for neutral buoyancy, and a strict density-less-than-water flag. Retain threshold fill values outside [0,1].^[1]

wet density = dry density + water density × connected porosity × pore fill

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
wettedBulkDensityKgPerM3	Wetted bulk density kg per m3	number
modelWaterFillFractionAtNeutralBuoyancy	Model water fill fraction at neutral buoyancy	number
positiveBuoyancyUnderModel	Positive buoyancy under model	boolean

json

{
  "input": {
    "dryPumiceBulkDensityKgPerM3": 500,
    "waterDensityKgPerM3": 1000,
    "connectedPoreVolumeFraction": 0.6,
    "waterFilledConnectedPoreFraction": 0.5
  },
  "output": {
    "wettedBulkDensityKgPerM3": 800,
    "modelWaterFillFractionAtNeutralBuoyancy": 0.8333333333333334,
    "positiveBuoyancyUnderModel": true
  }
}

Limitations and assumptions

Fixed envelope volume and connected pores are assumed; an unreachable threshold is not a guaranteed flotation outcome.

Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Hyperconcentrated Flow Density Range Checker: Screen density-derived solid volume concentrations against a caller hyperconcentrated-flow band; existing mining tools infer pulp mass fraction, not this flow-regime volume policy, and gas-rich mixtures are unsupported. For a complementary task, use Clast Terminal Velocity Lithic: Balance spherical-clast buoyant weight against caller constant quadratic drag and report Reynolds number for applicability review; not a Stokes viscous law, nonspherical drag solver or hazard trajectory.

References

Pumice Density Floating Checker — tool.io

Similar or alternative tools

Hyperconcentrated Flow Density Range Checker
Screen density-derived solid volume concentrations against a caller hyperconcentrated-flow band; existing mining tools infer pulp mass fraction, not this flow-regime volume policy, and gas-rich mixtures are unsupported.
Clast Terminal Velocity Lithic
Balance spherical-clast buoyant weight against caller constant quadratic drag and report Reynolds number for applicability review; not a Stokes viscous law, nonspherical drag solver or hazard trajectory.