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# Foodstuff - Thermal Diffusivity

## Thermal diffusivity of some selected food products.

Thermal diffusivity is the rate of transfer of heat of a material from the hot side to the cold side - a measure of how quickly a material can absorb heat from its surroundings. It can be calculated by taking the thermal conductivity divided by density and specific heat capacity at constant pressure.

Thermal diffusivity has the SI derived unit of [m²/s], and is usually denoted α but a, κ, K, and D are also used. The formula is:

α =k / (ρ CP)            [1]

where

α = thermal diffusivity (m2/s)
k = is thermal conductivity [W/(m·K)]
ρ = density [kg/m³]
CP = specific heat capacity [J/(kg·K)]

Thermal diffusivity of selected foodstuff:

Foodstuff - Thermal Diffusivity
FoodstuffWater Content
(% wt)
Temperature
(oC)
Thermal Diffusivity
(10-7 m2/s)
Apple, juice 37 5 1.05
Apple, whole 85 0 - 30 1.37
Banana, flesh 76 5 1.18
Beans, baked 4 - 122 1.68
Beef, chuck 66 40 - 65 1.23
Beef, round 71 40 - 65 1.33
Beef, tongue 68 40 - 65 1.32
Cherries, flesh 30 1.32
Codfish 81 5 1.22
Corned beef 65 5 1.32
Grapefruit, flesh 89 1.27
Halibut 76 40 - 65 1.47
Ham, smoked 64 5 1.18
Lemon, whole 72 40 1.07
Lima beans, pureed 26 - 122 1.80
Pea, pureed 16 - 122 1.82
Peach, whole 27 1.39
Potato, cooked and mashed 78 5 1.23
Potato, flesh 25 1.70
Rutabaga 48 1.34
Squash, whole 47 1.71
Strawberry, flesh 92 5 1.27
Sugarbeet 14 1.26
Tomato, pulp 4 1.48

## Related Topics

• ### Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

## Related Documents

• ### Drying Temperature and Time for Products

Drying temperature and time for products like food, coffee, fruits, lumber and more.
• ### Food and Foodstuff - pH Values

pH in common food products - like apples, butter, wines and more.
• ### Food and Foodstuff - Specific Heat

Specific heat of common food and foodstuff like apples, bass, beef, pork and many more.
• ### Food Products - Bulk Densities

Bulk densities of some common food products like grain, corn, barley, sugar and more.
• ### Food Products - Osmotic Pressures

Osmotic pressure in food products.
• ### Food Products - Viscosities

Absolute (dynamic) viscosity for common food products.
• ### Foods - Thermal Conductivities

Thermal conductivity of selected foodstuff like apples, beef, sugar and more.
• ### Frozen Food - Storage Life

Practical storage life for common frozen food products.
• ### Fruits and Vegetables - Optimal Storage Conditions

Optimal temperature and humidity conditions for common fruits and vegetables.
• ### Microwave Heating

Heating with microwaves.
• ### Pasteurization - Temperatures and Time

Pasteurization methods, time and temperatures.
• ### Water - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables with thermal diffusivity of liquids and gaseous water at varying temperarures and pressures - SI and Imperial units.
• ### Water Content in Food and other Products

Water content before and after drying - in food and other products cork, grain, soap, peat, wood and more.

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## Citation

• The Engineering ToolBox (2020). Foodstuff - Thermal Diffusivity. [online] Available at: https://www.engineeringtoolbox.com/foodstuff-thermal-diffusivity-d_2176.html [Accessed Day Month Year].

Modify the access date according your visit.

6.3.17

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