Types of check valves. A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check valves, the ball is spring-loaded to help keep it shut.
(October 2016) Learning is the act of acquiring new, or modifying and reinforcing existing, knowledge, behaviors, skills, values, or preferences which may lead to a potential change in synthesizing information, depth of the knowledge, attitude or behavior relative to the type and range of experience.
For active learning in the context of machine learning, see Active learning (machine learning). Active learning is a teaching method that strives to more directly involve students in the learning process. (Weltman, p. 8) It is a model of instruction that focuses the responsibility of learning on learners.