This book has been written as a beginning engineering text. It is not intended for advanced students, nor have we attempted to give an all- inclusive treatment of the subjects we have selected.The key to the book is the significance of the two adjectives in the first sentence. It is a beginning book, aimed at students who come to the unit operations for the first time. - Ushbu kitob boshlang'ich muhandislik matni sifatida yozilgan. Bu ilg'or talabalar uchun mo'ljallanmagan va biz tanlagan fanlarni har tomonlama ko'rib chiqishga harakat qilmaganmiz. Kitobning kaliti - birinchi jumladagi ikkita sifatning ahamiyati. Bu boshlang'ich kitob bo'lib, birlik operatsiyalariga birinchi marta kelgan talabalar uchun mo'ljallangan.