* Thickness of a penny: A US penny is about 1.55 mm thick.
* Conversion to centimeters: There are 10 millimeters in a centimeter, so a penny is 1.55 mm / 10 = 0.155 cm thick.
* Total height: 1000 pennies * 0.155 cm/penny = 155 cm
Therefore, a stack of 1000 pennies would be approximately 155 centimeters tall.
