Borosilicate glass is made by heating sand with boron trioxide. Borosilicate glass has a much higher melting point than soda-lime glass. State and explain which type of glass would be best to make ...

‘Leather-hard clay’ is firmer than wet clay - it is good for detailed carving. Clay is leather-hard when it has dried for a few hours and has become slightly stiff. It feels cool to the touc ...