PITTSBURGH — PPG and its corporate foundation have donated $7.5 million to Pittsburgh's Carnegie Science Center, the largest gift ever given to the interactive museum.

The gift is part of more than $42.5 million being spent on a new 37,000-square-foot wing that will be known as the PPG Science Pavilion for at least 20 years.

Ann Metzger, who co-directs the science center, says the new wing will enable the museum to host “blockbuster” exhibits the center is now too small to accommodate.

The 36-year-old science center also hopes to create new science, technology, engineering and math — or STEM — programs with the expansion. The four-story project will also house the Rangos Giant Cinema.

Funds will be allocated to improve the riverfront trails along that stretch of the North Shore and provide new riverfront signage.