  This article discusses partition function of monatomic ideal gas which is
given in Statistical Physisc at Physics Department, Faculty of Mathematics and
Natural Sciences, Institut Teknologi Bandung, Indonesia. Students in general
are not familiar with partition function. This unfamiliarness was detected at a
problem of partition function which was re-given in an examination in other
dimensions that had been previously given in the lecture. Based on this
observation, the need of a simple but comprehensive article about partition
function in one-, two-, and three-dimensions is a must. For simplicity, a
monatomic ideal gas is chosen.
