For example, we know that air is a better insulator then styrofoamBut why?
Their extensive use of concrete as a building material was very inovativeNot really equipment though They did not invent the Archimedes screw however, don't use that an an answer :).
Some examples, not all of which were invented by the Romans (they were great at borrowing ideas from other cultures): -The aqueduct to bring fresh water into towns and cities -Well engineered roads to enable faster transportation to and from Rome -The slave galley, which used dozens of rowers together with sails, typically to fight battles in the Mediterranean sea-Roman baths, which used the water brought in by the aqueducts to allow people to get themselves clean.
Thermal insulation depends upon the material, its thickness, and its densityStyrofoam will conduct heat better because its atoms and molecules are closer together, and that means they can pass heat through easier.
