Microwave cooking Flashcards
(41 cards)
What does RADAR stand for?
RAdio Detection And Ranging
Micorwave radio signals were used in WW2 as
a track of the enemy
What is the approximate frequency of the microwave?
10^10 Hz
The definition of the microwave
Nonionizing waves of energy that create thermal changes
Do not cause dangerous chemical changes( as do ionizing rays)
What can be done with micro waves( 3 things)
Absorbed
Transferred
Reflected
In the microwave the heat is transferred via
Electromagnetic radiation
What is the driver of the waves in the microwaves
Magnetron
How does the microwave work?
- Vacuum electron tube that converts the electricity into microwaves
- The microwaves are set in motion by a fan.
- The waves are bouncing from the walls of the microwave
- Turntable helps to cook evenly
What is the power of the microwave?
500-750 watts
How is the food heated with the microwave?
The polarity is reversed 5 billion times a second
- Two major interactions ( with water and ionic conduction ( like Na+Cl-))
- Generation of the heat by fraction and transfer to other molecules by conduction
What are the appropriate materials for the containers?
Glassware,china,ceramic,plastic( heat tempered), paper towel( not for long), other that are labeled microwave safe
Why would you place round container in the microwave rather than rectangular?
Round- equal opportunity
Rectangular- heating more in the corners
Why should you use shallow containers?
Because the depth of the micro wave is limited ( approximately 10 cm)
Why you should not put recycled paper/ brown bags or metal dishes( aluminum foil)
The paper can catch fire
Metal( especially pointy) can create an accumulation of charge and cause fire
From the metal the waves bounce off( the walls of the microwave are metal)
What are three guidelines if you still want to use the metal in the microwave?
- Reasonably large
- Kept away from the walls
- Metal/foil is grounded along the bottom of microwave
The foods in the microwave cook from the ____, that is why you need to place ___ portions on the outside
Outside
Denser
What is the arrangement of the objects if you heating multiple items
The center should be left empty, because it will not get the microwaves from the walls , but only from the top, but the time should be prolonged, do unequal cooking
What should you do with the potatoes and hot dogs before cooking in the microwave?
Pierce in skin/peel so they do not explode
What portions should you place in the microwave
Smaller pieces are cooked faster
Why you should not heat in plastic?
Can be endocrine disturbers , heating the plastic can transfer this particles, fat and cheese,fatty food are more vulnerable
Microwave is very drying, so what should be done to hold moisture, avoid spattering and retain heat
Use paper towels,waxed paper, plastic wrap, microwavable covers
-Cover loosely to let steam escape
What factors influences the difference in cooking different food?
-Density – Volume – Starting temp – Shape of food( pointy vs round) – Composition of food -Container
How can you avoid uneven cooking?
-Stirring
-Rearranging/rotating
-Standing time (The amount of time it takes for food molecules to
stop vibrating after microwave process ends
• Cooking continues during this period of time, so it
is factored into the recipe’s time requirement)
Cooking vegetables in the microwave retains
Vitamins and minerals
