第 1 單元，第 1 課

Energy and States of Matter能量與物質三態

背單字

solid固體
An ice cube is a solid because it keeps its shape.
liquid液體
Juice is a liquid that takes the shape of the glass.
gas氣體
The gas inside a balloon spreads out to fill it.
compress壓縮
You can compress the air in a bicycle pump.
fluid流體
Air and water are both fluids.
kinetic energy動能
Faster particles have more kinetic energy.
temperature溫度
The temperature of the soup rose as it was heated.
absolute zero絕對零度
No material has been cooled all the way to absolute zero.
potential energy位能
Gas particles have more potential energy than solid particles.
thermal energy熱能
A bathtub of warm water has more thermal energy than a cup of it.
atom原子
A water molecule contains three atoms.
substance純物質
Pure water is a substance.
element元素
Oxygen is an element.
compound化合物
Water is a compound of hydrogen and oxygen.
element ratio元素比例
The element ratio in water is 2 hydrogen : 1 oxygen.
periodic table週期表
Look up the symbol for gold on the periodic table.
chemical formula化學式
The chemical formula for carbon dioxide is CO₂.
subscript下標
The subscript 2 in H₂O means two hydrogen atoms.

這課的重點字