Workplace Hazardous Materials Information System (WHMIS)

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The Workplace Hazardous Materials Information System (WHMIS) is a comprehensive national system for safe management of hazardous chemicals, which is legislated by both the federal and provincial jurisdictions. WHMIS is a three (3) part effort of labour, industry, and government which took several years to develop. It is unique in that it represents a consensus…

Chapter 4 LAB Activity: Eratosthenes and the Earth’s Circumference Answers

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Introduction Eratosthenes, a Greek geographer (about 276 to 194 B.C.), made a surprisingly accurate estimate of the Earth’s circumference. The legend follows that Eratosthenes used a deep vertical well near Syene, in southern Egypt which was entirely lit up by the sun at noon once a year as the basis of his calculations. He reasoned…