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Why was steel importance to the second industrial revolution?
Steel was lighter, cheaper, and stronger than iron, allowing for constructions and technologies that were impossible before. Steel was important to Second Industrial Revolution because it was much lighter compared to iron. --------------- It was cheaper than iron.
In a roman insula what was the floor made of?
Most likely heavier and more valuable materials on the lower floors, like stone and marble, and lighter and cheaper on the upper floors. The bottom levels of insulae were usually reserved for the more wealthy, so there would be better conditions and more aesthetically pleasing surroundings. While on the upper levels, cost was the biggest issue, so wood seems to be the most likely answer there.
What are The advantages and disadvantages of helium in airships?
First of all, there isn't much choice. To get the airship to lift, one has to use a gas that's lighter than air. Only two do that well enough to be useful, hydrogen and helium. Hydrogen is lighter and cheaper, but horribly flammable. Helium is more expensive, provide less lift, but is entirely non flammable.
Who invented the cigarette lighter?
The cigarette lighter was invented by German inventor Johann Wolfgang Dbereiner in 1823.
How was lightning rod invented?
The original lightning rods were heavy iron, and their wires were often damaged by strikes. Modern lightning rods and surge arresters use lighter materials, but these are designed to withstand the high temperatures caused by the electric discharge.
