why do coal miners use bettery powered lamps rather than candles, lanterns or other types of fires to light their way in the tunnels?
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Open flame lamps could ignite flammable gases which collected in mines , causing explosions and so battery powered lamps were developed to enclose the flame and prevent it from igniting the surrounding atmosphere.
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In deep coal mines the highly flammable toxic gases are present. ... If there is open source of fire is present in the mines then these gases will readily take the fire. Thus the coal miners should not use candle as the gases will catch fire and the workers will get affected by this.
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