Microwaves and How They Work

Microwaves are a form of high frequency radio waves similar to those used by a radio, including AM, FM and CB. They are similar to a television where the radio waves are converted to a picture on the screen. However, microwaves are much shorter than radio waves; approximately twelve centimetres wave length. Electricity is converted into microwave energy by the magnetron tube (which is the heart of the microwave oven).

From the magnetron tube, microwave energy is transmitted to the oven cavity through a small plastic covered piece. The microwaves are converted to heat in the food. The microwaves enter from the outside of the food and travel through the food losing half of their power every two to three centimetres. Continued cooking to the centre occurs by conduction.

Although pacemakers used to be affected by microwaves (as well as by other radio waves), they are now shielded and are not bothered by these interferences. This allows people with pacemakers to sit calmly by their radio or television and cook with microwave ovens.

When microwaves come in contact with a substance, any one or combination of three things may occur. They can be:

1.REFLECTED

2.TRANSMITTED

3.ABSORBED

Reflection:

Metal substances REFLECT microwave energy and because there is no absorption, there is no heating. This is why the oven interior is either stainless steel or epoxy-coated steel. This ensures that the microwaves are kept inside the cavity and evenly distributed throughout the food with the help of the turntable.

Transmission:

Such substances as paper, glass and plastic TRANSMIT microwave energy and do not become hot except from food. Because these substances do not reflect or absorb microwave energy, they are ideal materials for microwave cooking containers.

Absorption:

Food contains moisture and will ABSORB microwave energy, which causes the moisture molecules within the food to vibrate at an incredible rate (2,450,000,000 times per second). Friction, created by the vibration, produces heat energy which is conducted throughout the food.

Cookware and Utensil Guide

It is important to use the correct container when cooking in a microwave oven. The following will help you make the right selection.

How to Test a Container for Safe

Microwave Oven Use

TO TEST A CONTAINER FOR SAFE MICROWAVE OVEN USE: Fill a 1-cup glass measure with cool water and place it in the microwave oven alongside the empty container to be tested; heat one (1) minute at High. If the container is microwave oven- safe (transparent to microwave energy), the container should remain comfortably cool, the water in glass measure should be hot. If the container is hot, it has absorbed some microwave energy and should NOT be used. This test cannot be used for plastic containers.

Paper Products and Freezer Wrap

Waxed paper, paper plates, cups and napkins should not be used for heating or cooking food. Freezer wrap should not be used as it is not heat resistant and may melt. Paper towel, greaseproof paper and bake paper may be safely used for short periods of time for covering or lining.

Glass, Ceramic and China

Heat-Resistant glass cookware is invaluable in microwave cooking. Many of these items are readily available in most homes: glass jugs, mixing bowls, loaf dishes, covered casseroles, oblong baking dishes, pie plates and round or square cake dishes. Examples of this type of cookware are Pyrex® and Corningware®.

Dinnerware can be used for microwave heating. Many brands of dinnerware are microwave safe. Check the care information for reference to microwave use for dinnerware and serving pieces. If dinnerware is marked ovenproof, it frequently is safe to use in the microwave oven. However, to be sure, check by conducting microwave dish test previously mentioned.

Several types of glassware and dinnerware are not recommended for use in the microwave oven. Do not use dishes with metallic trim or containers with metal parts. Do not use cups or mugs with glued on handles, as they may fall off with continued heating. Do not use delicate glassware. Although the glassware may be transparent to microwave energy the heat from the food may cause the glassware to crack.

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Panasonic NN-S215, NN-S235 Microwaves and How They Work, Cookware and Utensil Guide, Reflection, Glass, Ceramic and China
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NN-S235, NN-S215 specifications

Panasonic has long been a reputable name in kitchen appliances, and its line of microwave ovens is no exception. The Panasonic NN-S215 and NN-S235 models are notable for their combination of advanced technology, user-friendly features, and reliability.

The NN-S215 is a 1.2 cubic feet countertop microwave that operates at 1200 watts. It incorporates Inverter Technology, a standout feature that delivers consistent and even cooking results. Unlike traditional microwaves that use a pulsing mechanism to reduce power, Inverter Technology provides a steady stream of power, ensuring that food is cooked uniformly without hot spots. This results in better texture and flavor, especially for delicate foods like fish or sauces.

The NN-S215 also offers a variety of power levels, allowing users to customize their cooking experience. It includes one-touch sensor cooking and reheating features that automatically calculate cooking times based on the food type and weight. The microwave has convenient preset buttons for quick access to popular cooking options like popcorn, veggies, and entrees, making meal preparation more efficient.

Similarly, the NN-S235 model features the same capacity and inverter technology, but with added convenience. It comes equipped with a sleek, modern design that seamlessly fits into any kitchen decor. With a stainless-steel finish, this microwave also features a 4-digit display and an easy-to-use control panel.

Both models emphasize safety with a child lock feature that prevents unintentional usage. This is particularly important for households with young children, ensuring peace of mind for parents.

Additionally, the NN-S235 enhances the cooking experience by providing a Keep Warm feature that maintains food at ideal serving temperatures without further cooking it. The presence of a quick minute option allows users to add a minute of cooking time with a single press, further simplifying the cooking process.

In terms of energy efficiency, both models are designed to minimize electricity usage while maximizing performance. Their smart sensor technology optimizes cooking times and power levels, adding to their eco-friendliness.

Overall, the Panasonic NN-S215 and NN-S235 microwaves encapsulate a blend of advanced cooking technology, ease of use, and stylish design, making them excellent additions to any kitchen. Whether cooking, reheating, or defrosting, these microwaves deliver reliable and delicious results.
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