At 30°C, the area of a sheet of aluminum is 70 cm2 and the coefficient of linear expansion is 24 x 10-6°C . Determine the final temperature if the final area is 147.2 cm2 .

Grade 9 chemistry:

 Bob takes a break from singing and fills a balloon indoors where the temperature is 21 degrees Celsius (normal room temperature). Then, he puts the balloon in the fridge, where the temperature is 2 degrees Celsius. What will happen to his balloon? Why does this happen? 

Which situation will lead to the presence of dew most quickly?

◯ A. A rising humidity and a falling temperature.

◯ B. A falling humidity and a falling temperature.

◯ C. A falling humidity and a rising temperature.

◯ D. A rising humidity and a rising temperature.

which of these would not contribute to a global increase in temperature?