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MICROWAVING PRINCIPLES
Microwave energy has been used in this country to cook and reheat food since early experiments with
RADAR in World War ll. Microwaves are present in the atmosphere all the time, both naturally and
manmade sources. Manmade sources include radar, radio, television, telecommunication links and car
phones.
In a microwave oven,
electricity is
converted into
microwave by the
MAGNETRON.
REFLECTION
The microwaves
bounce off the metal
walls and the metal
door screen.
TRANSMISSION
Then they pass through
the cooking containers to
be absorbed by the water
molecules in the food, all
foods contain water to a
more or lesser extent.
ABSORPTION
The microwaves cause the water molecules to
vibrate which causes FRICTION, i.e. HEAT. This
heat then cooks the food. Microwaves are also
attracted to fat and sugar particles, and foods high
in these will cook more quickly. Microwaves can
only penetrate to a depth of 1
1
/2 - 2 inches(4-5cm)
and as heat spreads through the food by
conduction, just as in a traditional oven, the food
cooks from the outside inwards.
HOW MICROWAVES COOK FOOD
▲▲
▲
WEIGHT & MEASURE CONVERSION CHART
Ounces Hundredths of a Pound Tenths of a Pound Grams
1-2 .06-.15 0.1 50
3-4 .16-.25 0.2 100
5-6 .26-.35 0.3 150
7 .36-.45 0.4 200
8-9 .46-.55 0.5 250
10-11 .56-.65 0.6 300
12-13 .66-.75 0.7 350
14 .76-.85 0.8 400
15-16 .86-.95 0.9 450
■ WEIGHT DEFROST AND COOK CONVERSION CHART
POUNDS(lb.) GRAMS(g)
1
/4 114
1
/
2 227
3
/4 341
1 454
2 907
3 1361
4 1814
5 2268
6 2722
7 3175
8 3629
9 4082
10 4526
11 4990
■ POUNDS & OUNCES TO GRAMS
■ FLUID MEASUREMENTS
OUNCES(oz.) GRAMS(g)
128
257
385
4 113
5 142
6 170
7 198
8 227
OUNCES(oz.)
GRAMS(g)
9 255
10 284
11 312
12 340
13 369
14 397
15 425
16 454
1 Cup = 8 fluid ounces = 240 ml.
1 Pint = 16 fluid ounces = 480 ml.
1 Quart = 32 fluid ounces = 960 ml.
1 Gallon = 128 fluid ounces = 3840 ml.
110˚C
120˚C
130˚C
230˚F
248˚F
266˚F
140˚C
150˚C
160˚C
284˚F
302˚F
320˚F
170˚C
180˚C
190˚C
338˚F
356˚F
374˚F
200˚C
210˚C
220˚C
392˚F
410˚F
428˚F
230˚C
240˚C
250˚C
446˚F
464˚F
482˚F
TEMPERATURE MEASUREMENTS
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