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粉筆

彩色粉筆

粉筆粵拼fan2 bat1)係日常生活中好多人用嘅工具,一般用嚟寫喺黑板。佢一般係長形圓柱體,包括白同好多種除黑色意外嘅其它彩色。

起源

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喺未有文字嘅原始社會之前,人類就用木炭嚟畫畫。到咗中世紀,啲人開始發現用石灰溝水,可以整成一嚿嚿嘢,跟住用類似木炭筆嘅方法,記喺深色或硬嘅表面,由於嗰時未有紙,即使有,買一沓返嚟要使好多錢。而且畫喺木板或岩石度又好易被整甩。由於經歷咗成千年,所以好難考證到邊位發明粉筆出嚟,但最早唔喺教學用。直到黑板出現咗之後先至開始廣泛應用。

材料

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古代嘅粉筆成日用天然白堊整,而家大多數用其它嘢取代咗。以前市面上買嘅普通粉筆係用CaSO4嘅白色沉澱物同水結晶(CaSO4·2H2O)整,由於佢係微溶物,所以顆粒重大過粉塵,吸入氣管會令唔舒服,嚴重嘅可能導致肺癌。由於佢質地輕,加上散發出啲粉塵搞到周圍好邋遢,所以而家啲環保粉筆大多數用CaCO3嚟整。

種類

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無塵粉筆

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無毒粉筆

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粉筆
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