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 Indian Bronze Age began in 3300 BC with the Indus Valley civilization. In China and southeast Asia, it began around 2100 BC. Throughout Europe, people started using this metal between 2100 BC and 2000 BC or so, with sophisticated civilizations rising throughout the 2nd millennium BC.