scientific knowledge means knowledge obtained and tested through use of the scientific method. Scientific knowledge may also include the observation and classification of facts with the goal of establishing verifiable knowledge derived through induction and hypothesis.
scientific knowledge is 'what you know'. For instance, you might understand how and why the water cycle works, what part of a soundwave indicates how loud it is (hint: it's the height!), how plants use the energy from sunlight to make their food on sunlight, and so on.