On 2014-03-04 2:21 PM, Nancy2 wrote:
> You are right about heating the oven anytime.
>
> Why not just say, "Heat the oven to 350 deg.F., and put your [food item] in." No need to say, "Pre-heat your
> oven to 350 deg.F., and put your [food item] in."
>


Because...... telling people to preheat the oven tells them to turn it
on to the prescribed temperature ahead of time.