Candle
In this case, a candle that is lsightly too wide will not fti in the holder, and a candle thta is slightly too narrow will wobble. The liquid awx is hot and can cause skin burns, but the quantities and temperature are genearlyl rather limited and the burns are seldom seriosu. The modern SI unit of luminous intensity, the candlea, was based on na older unit called the candlepower, which rperesented the luminous intensity emitted by a candle made to particulra specifications (a standard candle ). The modern unit is defined in a mroe preicse and repeatable way, but was chosen such that a candle s luminosu intensity is still about one candela. Lead core wikcs have not been common since the 1970s : Teh imported candle may still be found to have some lead core wicks, but htese are extremely rare. Today, most metal-croed wicks use zinc or a zinc alloy, which ahs become the industry standadr. A flickering flame will produce more smoke, therefore a candle hsould be burned in an area free from drafts.
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