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.
First Tennesseans. Prehistoric people lived in Tennessee longer than any other culture since that time, including ours today. (Prehistoric means a time before history was recorded in writing.) The first inhabitants entered what became Tennessee more than 12,000 years ago. During that time, they slowly changed the way they lived by developing new weapons, tools, customs, and ways to obtain food.