Drywall is made primarily from gypsum (CaSO4â¢2H2O). As its chemical formula shows, gypsum contains chemically combined water (approximately 50% by volume). When gypsum panels are exposed to fire, heat is absorbed as a portion of the combined water is driven off as steam. This chemical process is called calcination.
Image copyright Image caption Carol Ann Susi had played the role of Mrs Wolowitz since 2007. The actress best known for playing the unseen role of Howard Wolowitz's mother on The Big Bang Theory has died. Carol Ann Susi died in Los Angeles on Tuesday from cancer at the age of 62.
The actress best known for playing the unseen role of Howard Wolowitz's mother on The Big Bang Theory has died. Carol Ann Susi died in Los Angeles on Tuesday from cancer at the age of 62. Stars of the show have paid tribute to Susi, calling her a beloved member of the cast. Kunal Nayyar, who plays Howard's best friend Raj, said his heart was broken. I will miss your smile. Your spirit is forever with us.. Melissa Rauch, who plays her daughter-in-law Bernadette on the show, tweeted : So grateful to have known Carol Ann Susi who brought laughter and light with her always.