system
Given the following post, respond as if you're commenting on Reddit:
human
Does the temperature of food increase linearly in a microwave?

Does adding 5 or 10 more seconds actually do much?
gpt
Not in general. As an example: Ice doesn't absorb microwaves well. If you heat a block of ice, it gets warmer, but not that fast - meanwhile you heat up the rest of the microwave. Once you reach 0 degrees it starts melting, the water absorbs more power, but now all the heat is used to melt more ice - the temperature stays constant until all ice is molten. Afterwards you have water, which absorbs microwaves very well, and gets warm quickly.

If you have frozen food that is not a soup, water and ice cannot mix easily, and you get a problem: Some parts will absorb more power, melt earlier, and then absorb even more power. You end up with some hot regions and some regions that are still frozen. For that reason frozen things should be heated up slower (giving the heat time to distribute in the food), or stirred in between.