1 J0 kg 19. The floor of a building is made from a square, solid piece of concrete. When the temperature of the floor increases from 20"C to 28*C, each side of the square expands by 0.4 cm: If the temperature of the floor - were t0 decrease from 20PC to 8'C, by how much would each side of the square contract? 0.2 cm 0.4 cm 0.6 cm 1.0 cm It cannot be determined without knowing the coefficient of linear expansion of the concrete st be sity 20. The temperature of an ideal gas is directly Gonal t0 which of the following?'