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.
The Paleolithic is the earliest period of the Stone Age. The early part of the Paleolithic is called the Lower Paleolithic, which predates Homo sapiens, beginning with Homo habilis (and related species) and with the earliest stone tools, dated to around 2.5 million years ago.he three-age system is the periodization of human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies: the Stone Age, Bronze Age, and Iron Age.