Final answer:
In Social Studies, a science experiment is categorized as a primary source because it is a firsthand account produced by direct involvement or observation.
Step-by-step explanation:
A science experiment is considered a primary source, because it is an original document or record created by someone who directly participated in or observed the event in question. Primary sources are firsthand, original materials that have not been filtered through interpretation or evaluation by second parties. Therefore, they are sources closest to the origin of the information.