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# Microwave Heating

Microwaves penetrates food products and the heating extends within the entire product.

Packaging materials such as glass, ceramics and most thermoplastic materials allows microwaves to pass with little or no absorption.

The relation wavelength, frequency and velocity of electromagnetic waves:

λ = c / f                              (1)

where

λ = wavelength (m)

c = speed of light (3 108 m/s)

f = frequency (Hz, 1/s)

Permitted frequencies for microwave ovens

• 915 +- 13 Mhz
• 2450 +- 50 Mhz

The wavelengths can be calculated as

λ1 = (3 108 m/s) / (915 106 1/s)

= 0.328 (m)

λ2 = (3 108 m/s) / (2450 106 1/s)

= 0.122 (m)

## Related Topics

### • Thermodynamics

Work, heat and energy systems.

## Related Documents

### Electrical Equipment - Power Consumption

Typical power consumption and running time for common electrical equipment.

### Electromagnetic Spectrum

The electromagnetic spectrum with wavelengths and frequencies.

### Food - Energy Content

Energy in carbohydrates, fats and proteins.

### 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.

### Food-borne Infections and Diseases

Common bacteria and viruses found in food.

### Foods - Thermal Conductivities

Thermal conductivity of selected foodstuff like apples, beef, sugar and more.

### Foodstuff - Thermal Diffusivity

Thermal diffusivity of some selected food products.

### Heat Losses from Electrical Equipment

Heat loss from electrical equipment like switch-gear, transformers and variable frequency drives.

### 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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