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Depends on the temperature setting of the oven...
In order to make your commercial oven reach the proper temperature, make sure to read the manual that came with the oven. If you did not get a hard copy, you can easily obtain another one by calling up the manufacturer or going to their website.
177 degrees Celsius
You would preheat the oven for an eggless chocolate cake in the same way you would preheat the oven for any other type of cake: turn the oven on, set the thermostat to the required temperature, then wait for the oven to reach that temperature.
because yeast cells die at a hot temperature
The correct internal temperature for a beef rib roast is 135 degrees for medium rare. You should take it out of the oven when it reaches this temperature. Once it stands for abit, outside the oven, the internal temperature will reach 145 degrees.
A properly working oven will preheat to 180 degrees in 3 minutes. If the coil is old, it can take longer to reach that temperature. New convection ovens reach temperature in less time.
heat, heat up
Preaheating an oven is the process of setting the oven to the temperature required in the recipe about 15 minutes before you need to place the food in the oven. This means that the oven temperature will have reached the desired degree before you place the food in the oven. This is very important when baking cookies, cakes and other bakery items.
Check you turned the oven on. Also ensure that you have set the oven at the correct temperature.
Preheating an oven means setting a temperature before putting something in an oven. If you don't preheat the oven and put a turkey in the turkey wil be cooked for longer. Which can affect the texture, taste and what not.
YES ! (: