Reset Button. Most boilers have safety devices built in, so if these are tripped a simple reset may get your whole system working. The reset button is normally on the front of the boiler. Sometimes it's a dial that needs resetting to zero and turned back on.
A typical diffusion constant for a medium-sized molecule in water is about . If we want the smell to travel a quarter mile, or a little less than , we get a speed of. This speed is fantastically slow, and says that it would take ten million years for blood to diffuse out to a shark a quarter mile away.
By raising its head several feet out of the water, a White Shark may be better able to detect airborne scents that could indicate a rich source of food in the otherwise featureless expanse of the open ocean. To what extent the Great White relies on its sense of taste is also a matter of conjecture. There are a few, scattered reports of other sharks apparently rejecting food on the basis of taste, but this has not been tested.