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.
Ice, Megafauna and Hominids. The Quaternary Period began with an ice age about 1.8 million years ago. It is often called the Age of Humans. It continues up to the present time and is the period that we live in.It is divided into two epochs 1  : The Pleistocene Epoch - 1.8 million to 11,000 years ago. 2  The Holocene Epoch - 11,000 years ago to present.ce, Megafauna and Hominids. The Quaternary Period began with an ice age about 1.8 million years ago. It is often called the Age of Humans. It continues up to the present time and is the period that we live in.