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Surface Pressure using Wilhelmy-Plate Method Formula

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The Surface Pressure of Thin Film is the difference in interfacial tension between a clean interface and an interface in the presence of an emulsifier. Check FAQs

Π = - (\frac{ΔF}{2 \cdot (t + W plate)})

Π - Surface Pressure of Thin Film?ΔF - Change in Force?t - Thickness of Plate?W_plate - Weight of Plate?

Surface Pressure using Wilhelmy-Plate Method Example

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Here is how the Surface Pressure using Wilhelmy-Plate Method equation looks like with Values.

Here is how the Surface Pressure using Wilhelmy-Plate Method equation looks like with Units.

Here is how the Surface Pressure using Wilhelmy-Plate Method equation looks like.

0.0015 = - (\frac{-0.015}{2 \cdot (5000 + 16.9)})

0.0015Pa = - (\frac{-0.015N}{2 \cdot (5000mm + 16.9g)})

0.0015 = - (\frac{-0.015}{2 \cdot (5000 + 16.9)})

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Surface Pressure using Wilhelmy-Plate Method Solution

Follow our step by step solution on how to calculate Surface Pressure using Wilhelmy-Plate Method?

FIRST Step Consider the formula

Π = - (\frac{ΔF}{2 \cdot (t + W plate)})

Next Step Substitute values of Variables

∴

Π = - (\frac{-0.015N}{2 \cdot (5000mm + 16.9g)})

Next Step Convert Units

∴

Π = - (\frac{-0.015N}{2 \cdot (5m + 0.0169kg)})

Next Step Prepare to Evaluate

∴

Π = - (\frac{-0.015}{2 \cdot (5 + 0.0169)})

Next Step Evaluate

∴

Π = 0.00149494707887341Pa

LAST Step Rounding Answer

∴

Π = 0.0015Pa

Surface Pressure using Wilhelmy-Plate Method Formula Elements

Variables

Surface Pressure of Thin Film

The Surface Pressure of Thin Film is the difference in interfacial tension between a clean interface and an interface in the presence of an emulsifier.

Symbol: Π

Measurement: PressureUnit: Pa

Note: Value should be greater than 0.

Formulas to find Surface Pressure of Thin Film

Change in Force

The Change in Force is the difference between the initial and final force exerted on an object.

Symbol: ΔF

Measurement: ForceUnit: N

Note: Value can be positive or negative.

Formulas to find Change in Force

Thickness of Plate

Thickness of Plate is defined as the thickness of plate (usually the lowest dimension of the plate) under consideration.

Symbol: t

Measurement: LengthUnit: mm

Note: Value should be greater than 0.

Formulas to find Thickness of Plate

Weight of Plate

The Weight of Plate is defined as the force of attraction exerted on the plate by gravity.

Symbol: W_plate

Measurement: WeightUnit: g

Note: Value should be greater than 0.

Formulas to find Weight of Plate

Credits

Created by Pratibha

Amity Institute Of Applied Sciences (AIAS, Amity University), Noida, India

Pratibha has created this Formula and 100+ more formulas!

Verified by Prerana Bakli

University of Hawaiʻi at Mānoa (UH Manoa), Hawaii, USA

Prerana Bakli has verified this Formula and 1600+ more formulas!

Other Formulas to find Surface Pressure of Thin Film

Go Surface Pressure

Π = γ o - γ

Other formulas in Wilhelmy Plate Method category

Go Parachor given Surface Tension

P s = (\frac{M molar}{ρ liq - ρ v}) \cdot {(γ)}^{\frac{1}{4}}

Go Height of Magnitude of Capillary Rise

h c = \frac{γ}{(\frac{1}{2}) \cdot (R \cdot ρ fluid \cdot [g])}

Go Surface Tension for very Thin Plate using Wilhelmy-Plate Method

γ = \frac{F thin plate}{2 \cdot W plate}

Go Surface Tension Force given Density of Fluid

γ = (\frac{1}{2}) \cdot (R \cdot ρ fluid \cdot [g] \cdot h c)

How to Evaluate Surface Pressure using Wilhelmy-Plate Method?

Surface Pressure using Wilhelmy-Plate Method evaluator uses Surface Pressure of Thin Film = -(Change in Force/(2*(Thickness of Plate+Weight of Plate))) to evaluate the Surface Pressure of Thin Film, The Surface Pressure using Wilhelmy-Plate Method formula is determined by measuring the change in force for a stationary plate between a clean surface and the same surface with a monolayer present. Surface Pressure of Thin Film is denoted by Π symbol.

How to evaluate Surface Pressure using Wilhelmy-Plate Method using this online evaluator? To use this online evaluator for Surface Pressure using Wilhelmy-Plate Method, enter Change in Force (ΔF), Thickness of Plate (t) & Weight of Plate (W_plate) and hit the calculate button.

FAQs on Surface Pressure using Wilhelmy-Plate Method

What is the formula to find Surface Pressure using Wilhelmy-Plate Method?

The formula of Surface Pressure using Wilhelmy-Plate Method is expressed as Surface Pressure of Thin Film = -(Change in Force/(2*(Thickness of Plate+Weight of Plate))). Here is an example- 0.001495 = -((-0.015)/(2*(5+0.0169))).

How to calculate Surface Pressure using Wilhelmy-Plate Method?

With Change in Force (ΔF), Thickness of Plate (t) & Weight of Plate (W_plate) we can find Surface Pressure using Wilhelmy-Plate Method using the formula - Surface Pressure of Thin Film = -(Change in Force/(2*(Thickness of Plate+Weight of Plate))).

What are the other ways to Calculate Surface Pressure of Thin Film?

Here are the different ways to Calculate Surface Pressure of Thin Film-

Surface Pressure of Thin Film=Surface Tension of Clean Water Surface-Surface Tension of Fluid

Can the Surface Pressure using Wilhelmy-Plate Method be negative?

No, the Surface Pressure using Wilhelmy-Plate Method, measured in Pressure cannot be negative.

Which unit is used to measure Surface Pressure using Wilhelmy-Plate Method?

Surface Pressure using Wilhelmy-Plate Method is usually measured using the Pascal[Pa] for Pressure. Kilopascal[Pa], Bar[Pa], Pound Per Square Inch[Pa] are the few other units in which Surface Pressure using Wilhelmy-Plate Method can be measured.