King of all llamas
I'm just curious. Why is it that we use microwave ovens to cook food and not some other wave of the EM spectrum?
I assume what he means is that the EM waves can cause gene and cell mutations in living creatures. A slab of beef in a microwave isn't going to get cancer if the waves somehow modify it's structure. All the waves do, from my understanding, is heat up the water molecules inside the food item. They do this by finding a microwave frequency that will resonate with a water molecule causing it to vibrate and heat up. As far as I know, most microwaves operate at the 10GHz range.Thank you very much ShawnD :)
You mentioned that if the microwaves leaked out, it could kill us. But I wonder, if it could harm us, how is it safe for our food? I see some people sometimes place a sheet of white tissue paper over their food before heating it up. Why do they do this?
Microwaves do not have enough energy to cause cell mutations. Even some of the weaker UV light can't do that. It's dangerous more because of heat; your arm is made of the same stuff you intend to put in the microwave oven. Have you ever seen a piece of chicken or steak explode in the microwave because it had a pocket of water in it? That could just as easily be your arm if you're not properly shielded. Without shielding, microwaves can be dangerous simply because people will underestimate what radiation is capable of doing. Wearing an oven mit will protect your hands when you take something out of the oven, but oven mits will not protect you from microwaves. Your hands will heat up just as quickly as if you were not wearing mits, and if I remember correctly, microwaves penetrate several centimeters of the food being cooked. That means your arm won't heat up the same as if you hold a blow dryer to it, it will immediately cook right to the bone and you might not feel this happening.I assume what he means is that the EM waves can cause gene and cell mutations in living creatures.
As for your last question, people put a paper towel over the food to keep the food from splattering all over the microwave. Things sometimes "explode" in a microwave. For example, a Twinkie explodes in 45 seconds (according to the manufacturer).
Why pi bonds and lone pairs, as opposed to other kinds.ShawnD said:Usually it isn't that violent as anybody that has used a microwave knows, sometimes a few drops of sauces splatter on the walls from escaping air.
UV mainly applies to things with pi bonds and lone pairs; that would be things like sugars, fats, and proteins.
If I remember correctly it had something to do with the n --> pi* transition. n is a lone pair electron and pi* is an excited electron that is part of a double bond. Just as an example, methanol has lone pairs but no pi bonds, so it does not absorb UV. Acetone has a pi bond connected to an oxygen which has lone pairs; acetone strongly absorbs UV.Why pi bonds and lone pairs, as opposed to other kinds.
I stumbled across this while doing a search:isnt microwaving a metal object somewhat dangerous