In the metric system, kilograms are used instead of pounds. 1 kg 2.2 lb Tom bought 1 kg of potatoes. This newborn baby This man weighs weighs 3.2 kg. 84 kg. 1 kg 2.2 lb 84 kg 185 lb 3.2 kg 7 lb Milligrams are used to measure very small weights. For example, a certain multivitamin contains 60 mg of vitamin C. Which metric unit of weight (mass) would we use in each case in Example 3? Fill in the blank with the appropriate metric unit. Use milligrams, grams, or kilograms. a) A full-size pickup truck weighs about 4600 . b) Tim bought an apple that weighed 170 . c) A frozen diet dinner contains 650 of sodium. Solution a) A full-size pickup truck weighs about 4600 kg. (This is about 10,141 lb.) The metric system uses kilograms instead of pounds. b) Tim bought an apple that weighed 170 g. (170 g 6 oz) The unit of kg would be too large for an apple, and mg would be too small. c) A frozen diet dinner contains 650 mg of sodium. (650 mg 0.02 oz) Milligrams are used to measure very small amounts. EXAMPLE 3 www.mhhe.com/messersmith SECTION 7.3 The Metric System: Capacity and Weight (Mass) 593
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