Because effective science instruction integrates seatwork with laboratory experiences, it is important to maintain approximately 40 to 50 square feet per student in the science classroom. Two states recommend a maximum of 28 students per science classroom - Georgia and Maryland. One state recommends a maximum of 15 students per laboratory - Iowa. One state recommends a maximum of 20 students per classroom - Wyoming. 20 states have guidelines that either set a maximum class size of 25 or fewer or base student limits on the size of the classroom.
Class size is part of the negotiated contract in several states.
These regulations and recommendations from professional organizations identify clear limits on space allocation and the numbers of students per classroom. B. Facilities Emergency Evacuation Route Emergency evacuation routes should be established for each classroom, and students instructed in evacuation plans. The plans should be a part of the chemical hygiene plan. In the event of a fire or electrical accident, shut off the gas and electricity in the laboratory. Emergency Communication Classroom teachers should be able to use a telephone or intercom to contact administrators or the school nurse in the event of an emergency.