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Engineering Calculator · 126

Water Absorption & Dimensional Change Calculator

Calculate measured mass change and linear dimensional change after a defined conditioning or liquid-exposure procedure.

Thermal & material change
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Signed mass change2%
Measured mass difference0.2g
Signed linear dimensional change2%
Measured dimension difference0.4mm

Formula
Δm%=m1−m0m0 100%\Delta m_{\%}=\frac{m_1-m_0}{m_0}\,100\%ΔL%=L1−L0L0 100%\Delta L_{\%}=\frac{L_1-L_0}{L_0}\,100\%

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

Mass change is the conditioned-minus-original mass divided by original mass. Linear dimensional change uses the same relationship for one measured dimension. Both remain signed: a negative value indicates net mass loss or shrinkage, rather than being clipped to zero or described as negative water uptake.

Water Absorption & Dimensional Change Calculator engineering relationship diagramChoose mass, dimension or both measurement modes. The denominators are the prescribed original values. A mass increase represents water absorption only when the test controls other mass effects. One linear change is not volume swelling, and a mass percentage cannot be converted into dimensional growth without a justified material model. This dedicated schematic represents conditioned mass and linear dimension change and is not to scale.L₀L₁Original m₀Conditioned m₁Record mass and length independentlyBEFORE AND AFTER CONDITIONING · TOOL 126Measured quantitiesSigned mass change
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

Choose mass, dimension or both measurement modes. The denominators are the prescribed original values. A mass increase represents water absorption only when the test controls other mass effects. One linear change is not volume swelling, and a mass percentage cannot be converted into dimensional growth without a justified material model.

Calculation relationship
Δm%=m1−m0m0 100%\Delta m_{\%}=\frac{m_1-m_0}{m_0}\,100\%ΔL%=L1−L0L0 100%\Delta L_{\%}=\frac{L_1-L_0}{L_0}\,100\%

Choose mass, dimension or both measurement modes. The denominators are the prescribed original values. A mass increase represents water absorption only when the test controls other mass effects. One linear change is not volume swelling, and a mass percentage cannot be converted into dimensional growth without a justified material model.

Formula terms

Variables

L₀, L₁Original and conditioned values of the same measured dimensionmm
Δm%Signed mass change relative to original mass%
ΔL%Signed linear dimensional change relative to original dimension%

Use sequence

From measurement to review

  1. Record the exact compound, conditioning medium, temperature, duration and original measurement procedure.
  2. Choose the quantities actually measured and enter compatible before/after values.
  3. Report signed change with the conditions, distinguishing net mass change, water uptake and linear or volume swelling.

Limits

What this calculation does not confirm

  • Original mass and dimension are positive. Signed change is retained when exposure causes loss or shrinkage.
  • No diffusion rate, saturation time, volume swelling or water-to-dimension conversion is inferred.
  • Extraction, contamination, residual surface liquid and thermal expansion can affect measurements; follow the material-specific test method.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceIs every conditioned specimen mass increase water absorption?

Only when the procedure controls other contributions. Surface liquid, contamination, chemical uptake and material extraction can affect the net result; use the prescribed conditioning and weighing method.

02Calculator guidanceCan water absorption percentage predict nylon gland dimensional swelling?

Not by itself. The relation depends on the resin grade, reinforcement, conditioning and geometry. Enter an actual measured dimension rather than deriving it from mass uptake.

03Calculator guidanceWhy does the swelling tool retain negative percentage changes?

A negative mass change records net loss, and a negative linear change records shrinkage. Those are meaningful observations requiring investigation; clipping them would hide the measurement.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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