Exploring St Elmo's Fire

The video explores the phenomenon of St Elmo's Fire, a bluish glow seen on ship masts and airplane wings. It delves into the historical origins linked to Saint Elmo, the patron saint of sailors, and explains the scientific basis involving electric charges and plasma. The video also discusses safety concerns and modern applications, such as ozone machines and photocopying technology.

What is the visual appearance of St Elmo's Fire?

• A greenish glow with a whistling sound

• A bright red glow with a hissing sound

• A bright bluish purplish glow, sometimes with a buzzing sound

• A dim yellow glow with a crackling sound

Who is St Elmo, after whom the phenomenon is named?

• A mythical sea creature

• A Christian saint and patron of sailors

• A scientist who discovered the phenomenon

• A famous sailor from the 18th century

What causes the luminous effect of St Elmo's Fire?

• Reflection of sunlight on water

• Combustion of gases in the atmosphere

• Corona discharge from sharp objects

• Magnetic fields around the Earth

Where does plasma tend to concentrate in the context of St Elmo's Fire?

• Flat surfaces like the ocean

• On the ground during a storm

• Sharp points like ship masts

• Inside closed spaces

What is one technological application of corona discharge mentioned in the video?

• Generating electricity for homes

• Heating water for industrial use

• Creating ozone for disinfection

• Producing sound waves for communication