The difference between a tacit understanding and an explicit understanding in science lies in how knowledge is processed. Tacit understanding is intuitive and based on personal experience and insights; it may be difficult to articulate or teach. In contrast, explicit understanding involves clearly articulated concepts, theories, and documented information that can be easily communicated. Both forms of understanding are important in science, with tacit knowledge contributing to experiential learning, while explicit knowledge drives formal education and communication of scientific principles.