A few butterflies and many moth species spin a silk case or cocoon prior to pupating, while others do not, instead going underground. A butterfly pupa, called a chrysalis, has a hard skin, usually with no cocoon.
4. tension - (physics) a stress that produces an elongation of an elastic physical body; the direction of maximum tension moves asymptotically toward the direction of the shear. natural philosophy, physics-the science of matter and energy and their interactions; his favorite subject was physics.
exists and is an alternate of . It was proposed by Leon Festinger. It states that tension occurs when we become aware of our contradicting attitudes and behaviors. For example, an individual strongly believes that smoking is harmful and highly unrecommended, however, he goes out of his way and decides to smoke anyway.