With the knowledge of bill of materials (Table 3) and labor hours (Table 4), the total cost for. manufacturing the steel vessel is calculated and summarized in Table 5. Given that the steel vessel. has a storage capacity of 564 kg of CGH2, its cost is $539 per kg of stored hydrogen.
Prehistoric (Archaeological) & Historic Periods. The Prehistoric Period consists of time periods in the origin and evolution of humankind from about 2.5 million years to about 900 BCE. the Prehistoric Period is divided into the Archaeological Periods of the Stone, Bronze and Iron Ages.
1 Prehistory is the period that begins with the appearance of the human being, about five million years ago, and finishes with the invention of writing, about 6,000 years ago. 2  It is a long period divided into three stages: the Palaeolithic Age, the NeolithicAge and the Metal Age. It is a long period divided into three stages: the Palaeolithic Age, the NeolithicAge and the Metal Age. 2  The Palaeolithic Age began with our first ancestors and finished about 10,000 years ago. 3  During that period, human beings used tools made of stone and lived on hunting and gathering.