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.
But the most noteworthy were the ones made of stone. The first period of history is known as the Stone Age. This era is broken down into at least two periods: the Paleolithic or Old Stone Age (10,000 to 2.5 million years ago) and Neolithic or New Stone Age (5,000 to 10,000 years ago).The change from Paleolithic to Neolithic is associated with the end of the Ice Age.Many historians claim that there was a Mesolithic era or Middle Stone age around 10,000 to 12,000 years ago marking the transition between the Old Stone Age and the New Stone Age.he change from Paleolithic to Neolithic is associated with the end of the Ice Age. Many historians claim that there was a Mesolithic era or Middle Stone age around 10,000 to 12,000 years ago marking the transition between the Old Stone Age and the New Stone Age.