Bacteria from a dirty egg grows inside, turning the contents into a foul liquid, killing any embryo present. Gasses build up and generate pressure that may cause the egg to ooze or explode. I rescued this egg from one of my fairweather broody hens, who had abandoned her nest after two weeks of sitting. The egg was no longer warm when I found it, which didnât give me much hope for the embryoâs viability, but I placed it in my incubator hoping for the best a few days ago.
Another way to ask the same question is: Is the earth a perfect sphere? The answer is that its not, because the earth spins it bulges at the equator and hence the sea is not at the same level all over the world. It depends on what your margin for error is really.
MSL, or mean sea level, is the altitude above sea level. Since AGL, or above ground level, changes as you go over differing terrain, we use MSL to set our altimeter so we are on a common measurement. For instance, where I live, in the Willamette Valley of Oregon, our elevation is only about 200' above sea level.