quiz for Friday - shortie

[Penny]

1. What is the square root of 225

2. Which explosive gas was one used to inflate airships

3, What does AC stand for in electricity

4.What do we call the boundary between two air masses

5. What does a chronometer measure.

cheers Penny

[vannin]

5, To measure longitude at sea or where very exact timing is needed

[Penny]

Correct vannin, well done. Cheers Penny

[dita]

3. Alternating Current

[Monika]

1. 15

[Penny]

Well done, Monica and Dita. Clever folks. Cheers Penny

[widget]

2, Helium

[Penny]

Good one widget. Well done. Cheers Penny

[ciderman_nz]

Not helium. Hydrogen is the one that catches fire.

[widget]

Good thinking ciderman, just been doing a bit of Googling and found this, so none the wiser!!!


Which gas is used in hot air balloons?
A gas balloon is spherical in shape and typically has about one-fourth the internal volume of a hot-air balloon. The spherical fabric part of the balloon is known as the “envelope” and is gas-tight. It contains a gas that is significantly lighter than air. The gas used is either Helium or Hydrogen.28 Aug 2012

[Penny]

So sorry widget. Lost my bit of paper so took a chance? The answer being Hydrogen. Good job we have ciderman to hand. Cheers Penny,