oven mitts
Most likely because metal is not known to be a very flammable material and can withstand the kind of heat that an oven is potentially able to produce.
heat makes metal expand.
Yes, if the trays are full.
Stainless steel and aluminum are commonly used to make oven trays because they are durable, heat-resistant, and conduct heat evenly for baking. They are also non-reactive with food, making them safe for cooking.
The advantage of oven drying method is that all the trays get equal heat and therefore the drying is uniform. The disadvantage is that the dehydrator has limited capacity.
Baking trays are typically made from aluminum due to its ability to conduct heat evenly and resist corrosion. Stainless steel and non-stick coated trays are also commonly used.
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cheese
Wood is porous and sucks in moisture. Also wood could catch on fire while in an oven.
No, just push one tray, pot or what ever you are cooking with to one side of the oven and the other to the opposite side so the bottom tray can "see" the top of the oven. if the trays are to big to do that half way through your cooking switch the trays so the bottom tray is on the top.
Yes its a good idea, Make sure their is no heating element under the base, in your oven, Otherwise should be fine, I put all my oven trays, upside down, in the dishwasher regularly, Saves a lot of scrubbing,