Countries that use Celsius use it in their ovens.
Yes, microwave ovens use electromagnetic radiation.
Most ovens do not use fire, they simply heat up the air with electricity.
Conventional ovens and some toaster ovens can be used to bake muffins. You cannot use a microwave oven to bake regular muffins.
what year did the Sumerians first use the sundial
Of course. Gas-powered ovens as well as microwave ovens are very common. More traditional ovens include wood and coal-powered ovens, but those are mostly found on small villages and cities.
They use electromagnetic waves. cellphones use radio waves while electric and microwave ovens use infrared and/or microwaves
There is no one universal light bulb for ovens.
The Sumerians used the reed stylus to write. Unlike nowadays we use pen or pencils.
Ovens do not actually use radiation to heat food. "Ordinary" ovens simply use a high-resistance material as a heating element, which, when an electric current is run through, discharges a large amount of heat.
There are no radioactive materials in microwave ovens: they use microwaves to cook food and heat liquids.
Researching the way people use microwave ovens to determine how to improve their design