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What metric units would you use to measure the thickness of a key

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?