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The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

In which situation can a mixture always be called a solution

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 ?