21/10/2007	atmosphere	n.	a gaseous layer surrounding the earth	大氣層
21/10/2007	planet	n.	a celestial oject moving arround a star	行星
21/10/2007	crust	n.	the outermost rocky layer of earth	地壳
21/10/2007	mantle	n.	the layer underneath crust in the layered structure of earth	地幔
21/10/2007	noble gas	n.	"the class of elements including element helium, neon etc."	貴氣體
22/10/2007	black	n.	the colour of copper(II) oxide	黑色
22/10/2007	fractional distillation	n.	method used to separated different components in liquefied air	分餾
22/10/2007	constituent	n.	"another word for the term ""component""."	成份
22/10/2007	determine	v.	to know the quality or quantity of something	測定
22/10/2007	nitrogen	n.	the component in air which has the lowest boiling point	氮
22/10/2007	argon	n.	the most abundant noble gas in air	氬
23/10/2007	welding	n.	method of joining two pieces of metal together	焊接
23/10/2007	ethyne	n.	chemical used in wielding with oxygen	乙炔
23/10/2007	inert	n.	a chemical properties of nitrogen	惰性
23/10/2007	ammonia	n.	a nitrogen containing compound commonly used to make fertilizer	氨
23/10/2007	refrigerant	n.	the chemical used in a refrigerator to transport heat from the inside to the outside	致冷劑