Infiltration happens when..

IV infiltrations and extravasations occur when fluid leaks out of the vein into surrounding soft tissue. Common signs include inflammation, tightness of the skin, and pain around the IV site. IV infiltration is a common complication of intravenous (IV) therapy.

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Infiltration occurs when surface water enters the soil. ... The sponge soaks up the water until it can hold no more. At this point, the soil becomes saturated, but the excess water has to go somewhere. When this happens, we get overflow in the form of runoff, which is when surface water flows over land.

Explanation:

trigonal pyramidal

tetrahedral

trigonal planar

bent