What is lightening?
Lightening is the process of sudden electrostatic discharge between the same clouds ,between the different clouds or between the clouds and the earth.Lightening strike causes loss of life and property.Electric instruments are more prone to damage from lightening.
Why lightening occurs?
Have you done experiments with balloon? After rubbing the balloon with dry hair,it attracts small pieces of paper.This happens because charge is buildup on the balloon due to friction and it induces opposite charge on paper.Unlike charges attract.
Similarly clouds are made up of tiny droplets of water.On the top of the cloud temperature is below freezing point and droplets become ice.Cloud over the cloud stick and makes thundercloud.As these clouds move continuous friction between the ice crystals causes accumulation of electric charge.Positive charge forms on the top of the cloud and negative charge buildup at the bottom of the cloud.As air is a bad conductor charges are continued to accumulate.When the charge accumulation reaches to a critical level,air between the opposite charges ionizes and make a conductive path and flash of light occurs. Very high current and temperature is generated during lightening.High temperature causes expansion of the gases and leads to thundering.This process may occurs within the cloud or between the other clouds of opposite charge.Negative charge at the bottom of the cloud induces positive charge on the high objects on the earth surface.The earth objects may be tall trees ,lightening arrester or may be people sometime. The process is called electric discharge.
Why thundering sound after lightening?
Though lightening and thundering occur at the same time,light travel faster(3 lakh km/sec) than sound(332 meter/sec).So we see lightening earlier than hearing the thunder.
Lightening facts:
1.Lightening contains millions of volts of electricity.
2.Lightening temperature may range 20000 degree Celsius.
3.Study of lightening is called as fulminology.
4.Fear of lightening is called as astraphobia.
5.Thousands of people die due to lightening.
Safety Measures to avoid Lightenig accident:
As lightening destroy life and property we need to take safety measures to avoid the accident.
1.Lightening arrester: A metallic rod taller than the building is installed on the building.Metallic rod is very good conductor of electricity.One end of the rod is deep buried into the ground.During lightening high current is transferred to the ground thus saving our electrical equipment from damages.This metallic rod is called lightening arrester.
2. Do not carry umbrella with pointed cap.
3. Do not hide beneath the tall trees like coconut.
4. When thunder roars go indoors.Go to safer and enclosed place.
5.Do not plan trip when thundering starts.
6. If you moving in enclosed vehicle like car or bus, do not come out.Open vehicles are not safe.
7.If you are in open space with no shelter stay away from poles,trees etc.crouch low. Hide your head between the knees.
When you are indoor:
1.Avoid water.Lightening can travel through water pipe.
2.Avoid corded phones.
3.Avoid using electrical equipment.stay away from wires.
Lightening is the process of sudden electrostatic discharge between the same clouds ,between the different clouds or between the clouds and the earth.Lightening strike causes loss of life and property.Electric instruments are more prone to damage from lightening.
Why lightening occurs?
Have you done experiments with balloon? After rubbing the balloon with dry hair,it attracts small pieces of paper.This happens because charge is buildup on the balloon due to friction and it induces opposite charge on paper.Unlike charges attract.
Similarly clouds are made up of tiny droplets of water.On the top of the cloud temperature is below freezing point and droplets become ice.Cloud over the cloud stick and makes thundercloud.As these clouds move continuous friction between the ice crystals causes accumulation of electric charge.Positive charge forms on the top of the cloud and negative charge buildup at the bottom of the cloud.As air is a bad conductor charges are continued to accumulate.When the charge accumulation reaches to a critical level,air between the opposite charges ionizes and make a conductive path and flash of light occurs. Very high current and temperature is generated during lightening.High temperature causes expansion of the gases and leads to thundering.This process may occurs within the cloud or between the other clouds of opposite charge.Negative charge at the bottom of the cloud induces positive charge on the high objects on the earth surface.The earth objects may be tall trees ,lightening arrester or may be people sometime. The process is called electric discharge.
Why thundering sound after lightening?
Though lightening and thundering occur at the same time,light travel faster(3 lakh km/sec) than sound(332 meter/sec).So we see lightening earlier than hearing the thunder.
Lightening facts:
1.Lightening contains millions of volts of electricity.
2.Lightening temperature may range 20000 degree Celsius.
3.Study of lightening is called as fulminology.
4.Fear of lightening is called as astraphobia.
5.Thousands of people die due to lightening.
Safety Measures to avoid Lightenig accident:
As lightening destroy life and property we need to take safety measures to avoid the accident.
1.Lightening arrester: A metallic rod taller than the building is installed on the building.Metallic rod is very good conductor of electricity.One end of the rod is deep buried into the ground.During lightening high current is transferred to the ground thus saving our electrical equipment from damages.This metallic rod is called lightening arrester.
2. Do not carry umbrella with pointed cap.
3. Do not hide beneath the tall trees like coconut.
4. When thunder roars go indoors.Go to safer and enclosed place.
5.Do not plan trip when thundering starts.
6. If you moving in enclosed vehicle like car or bus, do not come out.Open vehicles are not safe.
7.If you are in open space with no shelter stay away from poles,trees etc.crouch low. Hide your head between the knees.
When you are indoor:
1.Avoid water.Lightening can travel through water pipe.
2.Avoid corded phones.
3.Avoid using electrical equipment.stay away from wires.
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