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.
Coming back to Neolithic and Paleolithic era, the latter was also called the Stone Age period. The Neolithic era began from 4000-2200 BC and the major activity that was carried out during this era was farming. The men were known as Mesolithic and carried out hunting, farming and stone carvers.