Surface Tension
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The surface tension of water provides the necessary wall tension for the formation of bubbles with water. The tendency to minimize that wall tension pulls the bubbles into spherical shapes (LaPlace's law).
Another name for this type of headache is "stress headache." When people say they have a stress headache, they usually mean they have a tension headache. Tension headaches may be mild or severe. Sometimes they hurt more than migraine headaches.
Most people describe a tension headache as a constant dull, achy feeling on both sides of the head. Some people with tension headaches also have a tight feeling in their head or neck muscles. Tension headaches usually begin slowly and gradually. They often start in the middle of the day.
posted by Ribbonfish Hazelwood @ 3:04 AM
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