Science fair and STEM fair projects are one and the same. STEM is an acronym that stands for science, technology, engineering and mathematics. Since most science fair projects include more than one STEM element, they tend to fall into the same category.
Making an erupting volcano, building a greenhouse, or comparing batteries are all popular science projects which fulfill the STEM requirement. In fact, STEM is transforming to STEAM, with the A representing the art and design element of learning and creating. Projects should touch on at least two points from the STEAM acronym in order to meet the criteria.