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.
Neolithic or New Stone Age: begins with the introduction of farming, dating variously from c. 9,000 BCE in the Near East, c. 7,000 BCE in Southeast Europe, c. 6,000 BCE in East Asia, and even later in other regions.aleolithic or Old Stone Age: from the first production of stone artefacts, about 2.5 million years ago, to the end of the last Ice Age, about 9,600 BCE.