FormulaDen.com

Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Emissivity of Body Formula

Fx Copy

LaTeX Copy

Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95. Check FAQs

ε = \frac{E}{E b}

ε - Emissivity?E - Emissive Power of Non Blackbody?E_b - Emissive Power of Blackbody?

Emissivity of Body Example

With values

With units

Only example

Here is how the Emissivity of Body equation looks like with Values.

Here is how the Emissivity of Body equation looks like with Units.

Here is how the Emissivity of Body equation looks like.

0.95 = \frac{308.07}{324.29}

0.95 = \frac{308.07W/m²}{324.29W/m²}

0.95 = \frac{308.07}{324.29}

Tip: Use pencil ( Pencil

) icon above to edit Input Values and Units.

Calculate

Recalculate

Solution

Copy

Reset

You are here -

Home » Category

Engineering » Category

Chemical Engineering » Category

Heat Transfer » fx Emissivity of Body

Emissivity of Body Solution

Follow our step by step solution on how to calculate Emissivity of Body?

FIRST Step Consider the formula

ε = \frac{E}{E b}

Next Step Substitute values of Variables

∴

ε = \frac{308.07W/m²}{324.29W/m²}

Next Step Prepare to Evaluate

∴

ε = \frac{308.07}{324.29}

Next Step Evaluate

∴

ε = 0.94998303987172

LAST Step Rounding Answer

∴

ε = 0.95

Emissivity of Body Formula Elements

Variables

Emissivity

Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.

Symbol: ε

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Emissivity

Emissive Power of Non Blackbody

Emissive Power of Non Blackbody is the energy of thermal radiation emitted in all directions per unit time from each unit area of surface of Non blackbody at any given temperature.

Symbol: E

Measurement: Heat Flux DensityUnit: W/m²

Note: Value should be greater than 0.

Formulas to find Emissive Power of Non Blackbody

Emissive Power of Blackbody

Emissive Power of Blackbody is the energy of thermal radiation emitted in all directions per unit time from each unit area of a surface of blackbody at any given temperature.

Symbol: E_b

Measurement: Heat Flux DensityUnit: W/m²

Note: Value should be greater than 0.

Formulas to find Emissive Power of Blackbody

Other formulas in Radiation Formulas category

Go Absorptivity given Reflectivity and Transmissivity

α = 1 - ρ - 𝜏

Go Area of Surface 1 given Area 2 and Radiation Shape Factor for Both Surfaces

A 1 = A 2 \cdot (\frac{F 21}{F 12})

Go Area of Surface 2 given Area 1 and Radiation Shape Factor for Both Surfaces

A 2 = A 1 \cdot (\frac{F 12}{F 21})

Go Emissive Power of Blackbody

E b = [Stefan-BoltZ] \cdot (T^{4})

How to Evaluate Emissivity of Body?

Emissivity of Body evaluator uses Emissivity = Emissive Power of Non Blackbody/Emissive Power of Blackbody to evaluate the Emissivity, The Emissivity of Body formula is defined as the ratio of Emissive Power of Non Blackbody to the Emissive Power of Blackbody at the same temperature. Emissivity is denoted by ε symbol.

How to evaluate Emissivity of Body using this online evaluator? To use this online evaluator for Emissivity of Body, enter Emissive Power of Non Blackbody (E) & Emissive Power of Blackbody (E_b) and hit the calculate button.

FAQs on Emissivity of Body

What is the formula to find Emissivity of Body?

The formula of Emissivity of Body is expressed as Emissivity = Emissive Power of Non Blackbody/Emissive Power of Blackbody. Here is an example- 0.949983 = 308.07/324.29.

How to calculate Emissivity of Body?

With Emissive Power of Non Blackbody (E) & Emissive Power of Blackbody (E_b) we can find Emissivity of Body using the formula - Emissivity = Emissive Power of Non Blackbody/Emissive Power of Blackbody.

Let Others Know

✖

Facebook

Twitter

Copied!

: Value
: Unit