Transcript heat
November 12, 2014 NO YOU DO NOT NEED TO WRITE THIS, NO ENTRY TASKS THIS WEEK I heat up almost everyday, But it's not that I am sick. I can burn occasionally, But to watch me is the trick. I can easily be substituted, By stove or oven or fire, But the time it'd take to do the job would Most probably be much higher. What am I? • What do you use a microwave for? • How often do you use it? Once a day, twice a day? Once a week? Hardly ever? How do microwaves work? Say watt? • Microwaves are measured in units called watts. • Microwave ovens range in wattage from: – 500 to 1,000 watts for compact microwave – 1,000 to 1,500 watts for a medium capacity microwave – The larger the watt, the more powerful the microwave, the faster contents get hot Heat • Microwave start molecules in the food moving, the resulting friction causes heat. • This starts on the outside and moves in • Generally the best choices for foods to use in microwaves are foods that are moist to begin with or can be cooked in moist heat. Fabulous Food Facts • FFF definition of a microwave: “Microwaves cook food by making the water molecules in food vibrate producing friction, which causes heat” Make sense now? Cooking Food • Foods that are heated most quickly in microwaves include: – Water – Fat – Sugar • Foods high in water, such as vegetables, will cook faster than foods with a lower water content, such as meat. Four Principles • These principles help guide microwave cooking: – Food density – Shape and size of food – Starting temperature of food – Amount of food Advantages 1. Warms up leftovers 2. Defrosts meat 3. Softens brown sugar if used immediately (Put 1 cup of water in microwave) Advantages 4. Eliminates extra oils and fats in preparing foods 5. Has made a great impact on today’s lifestyles and cooking habits. 6. Cook foods quickly with higher quality, tastes better, looks better and color enhanced. Acceptable dishes for the microwave • • • • paper plastic glass microwaveable dishes **Only use plastic containers that are labeled "microwave safe". Harmful chemicals may leak into food is you use a plastic container that is not made for microwave use. Unacceptable • • • Metal and foil Dishes with gold or silver on it If used in the microwave it can cause arcing, an electrical spark that can damage the oven or start a fire. Acceptable coverings • • • Paper towels - to absorb moisture, spatters, and spills Wax paper - holds in some of the moisture Plastic wrap - hold in moisture Techniques for microwaving • • • • • • • Stirring - To pull heated part of the food to the center. Turning over - To microwave all sides. Standing time - To allow the foods to complete its cooking (place directly on counter). Covering – a. Retains nutrients b. Holds in moisture c. Speeds up cooking. • Arrange food in circular shape - to make cooking even. • Rotating - Makes cooking even. • Pricking - (egg yolks and potatoes) to keep from exploding. • Select foods of the same size - cooks evenly Cooking hints • • • • Foods at refrigerator and freezer temperatures take longer to cook than those at room temperature. Density affects cooking time (dense foods potato) Bony pieces of chicken - put on outside Microwaved cook by entering the foods by the outside edges. Cooking Tips • • • Microwave containers include: plastic, paper and glass. Never put metal or foil items in the microwave. Cover containers with plastic wrap, paper towels, wax paper, or a lid. When removing covers or plastic wrap, use a potholder and tilt the cover away from you. • By covering foods in the microwave, it holds in moisture, helps food cook evenly and prevents food from splattering in the microwave. • When microwaving food, microwaves are attracted to fat, sugar and water molecules. • When cooking in the microwave, the volume of the food (small versus large potatoes); and the quantity or number will increase cooking and standing time. • When cooking, round containers will cook more evenly than food in square containers, which tend to burn in the corners. • To help food cook more evenly, stir and rotate foods while cooking; if available a turntable may be used to rotate foods. • Standing time at the end of cooking allows for foods to continue to cook when removed. • To prevent burning yourself from microwave cooking, remember: – Foods can create hot containers. – Items can explode (eggs, potatoes). Pierce them with a fork. – Lifting the cover or plastic from the food can cause a burn. – Hot steam escaping can cause a burn. Beware! • Concentrations of fat and sugar become much hotter than the rest of the food creating hot spots-areas of intense heat. Question to Ponder • How have microwaves changed our culture? • Think about family time, dinner and meals, health and wellness, etc. • Write your response on the back of your sheet and be ready to discuss. November 14, 2013 • Entry task- What unit of energy do microwaves use? • Target- Create informational microwave posters with your kitchen groups Your task now • Pick one of the following categories with groups of no more than four people • Create a poster illustrating your topic about microwaves – Here are your choices: • • • • • • • • Containers and wraps Foods you can cook Social and cultural change Hazards How it heats Microwave safety How to clean a microwave Microwave features