“Powder Technology” is a book of the opening lecture and 92 papers presented at The International Symposium on Powder Technology held at Kyoto International Conference Hall, Kyoto, Japan, September 28-October 1, 1981. This Symposium conmemorated the 25th anniversary of the Society of Powder Technology, Japan. There were approximately 280 researchers from Japan and over 50 from overseas representing the leading powder technologists in the world. After the opening lecture by Professor Iinoya, the papers were presented in eight technical sessions denoted by the key words and phrases given above.