Some double-glazing system trap air between two panes of glass. A.) explain how energy is transferred through a double-glazed window from a hot room to the cold air outside.
B.) state and explain how the rate of energy transfer would change if you removed the air from the gap.

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.