20MICROWAVING PRINCIPLESMicrowave energy has been used in this country to cook and reheat food since early experiments withRADAR in World War ll. Microwaves are present in the atmosphere all the time, both naturally and manmadesources. Manmade sources include radar, radio, television, telecommunication links and car phones.CONVERSION CHARTSIn a microwave oven,electricity is convertedinto microwave by theMAGNETRON.REFLECTIONThe microwavesbounce off the metalwalls and the metaldoor screen.TRANSMISSIONThen they pass through thecooking containers to beabsorbed by the watermolecules in the food, allfoods contain water to amore or lesser extent.ABSORPTIONThe microwaves cause the water molecules tovibrate which causes FRICTION, i.e. HEAT. Thisheat then cooks the food. Microwaves are alsoattracted to fat and sugar particles, and foods high inthese will cook more quickly. Microwaves can onlypenetrate to a depth of 4-5cm and as heat spreadsthrough the food by conduction, just as in a traditionaloven, the food cooks from the outside inwards.WEIGHT MEASURES15 g 1/2 oz.25 g 1 oz.50 g 2 oz.100 g 4 oz.175 g 6 oz.225 g 8 oz.450 g 1 lb.HOW MICROWAVES COOK FOODMicrowave oven is a Group 2 ISM equipment in which radio frequency energy is intentionally generated andused in the form of electromagnetic radiation for the treatment of material. This oven is a Class B equipmentsuitable for use in domestic establishments and in establishments directly connected to a low voltage powersupply network which supplies buildings used for domestic purposes.▲▲ ▲VOLUME MEASURES30 ml 1 fl.oz.100 ml 3 fl.oz.150 ml 5 fl.oz. (1/4 pt)300 ml 10 fl.oz. (1/2 pt)600 ml 20 fl.oz. (1pt)SPOON MEASURES1.25 ml 1/4 tsp2.5 ml 1/2 tsp5 ml 1 tsp15 ml 1 tbspFLUID MEASUREMENTS1 Cup = 8 fl.oz. = 240 ml1 Pint = 16 fl.oz. (UK 20 fl.oz.) = 480 ml (UK 560 ml)1 Quart = 32 fl.oz. (UK 40 fl.oz.) = 960 ml (UK 1120 ml)1 Gallon = 128 fl.oz. (UK 160 fl.oz.) = 3840 ml (UK 4500 ml)