Paper × 841 mm). A1 is half the size of a sheet of A0 (i.e., 594 mm × 841 mm), such that two sheets of A1 placed side by side are equal to one sheet of A0. A2 is half the size of a sheet of A1, and so forth. Common sizes used in the office and the home are A4 and A3 (A3 is the size of two A4 sheets). The density of paper ranges from for tissue paper to for some speciality paper. Printing paper is about . Paper may be classified into seven categories: Some paper types include:
Joss paper The Joss paper is folded in half, or bought pre-folded into the shape of gold ingots before being burned in an earthenware pot or a specially built chimney. Joss paper burning is usually the last performed act in Chinese deity or ancestor worship ceremonies. The papers may also be folded and stacked into elaborate pagodas or lotuses. In Taoist rituals, the practice of burning joss paper to deities or ancestors is acceptable. Some Buddhist groups, such as Kong Meng San Phor Kark See Temple in Singapore, have discouraged burning joss paper out of concern for the environment. Joss paper Joss