LIGHT 1
Introduction 3
How Light travels 3
How light behaves 6
Shadows 8
Colours of light 10
Making colours white 14
Reflection of light 16
Uses of mirrors 19
Parts of the eye 22
The eyes 22
How the eyes work 25
Making pictures with a lens 29
A water drop microscope 31
A pin-hole camera 34
光 37
光是怎样传播的 39
导言 39
光的特性 40
影子 41
光的色彩 42
使色彩呈白色 43
光的反射 44
镜子的应用 45
眼睛 46
眼睛的组成部分 47
眼睛是如何工作的 48
用透镜成像 49
水滴显微镜 50
针眼照像机 51
ELECTRICITY 53
Introduction 55
What is electricity? 55
How electricity travels 57
Conductors and insulators 60
off 64
How to turn electricity on and 64
How to light two bulbs in a circuit 69
Batteries and ways to obtain electricity 71
Electricity can give us heat 76
Electricity can give us light 78
Electricity can give us magnetism 80
Electricity is a form of energy 82
Be careful of electricity 83
Measurement of electricity 84
电 87
电是什么？ 89
导言 89
电是怎样传导的 90
导体和绝缘体 90
怎样开闭电流 92
怎样在一个电路中点亮两盏灯泡 94
电池以及获取电流的方法 94
电可以为我们供热 96
电可以给我们以光明 97
电是能量的一种形式 98
电可以为我们供磁 98
当心触电 99
电的度量 99
HEAT 101
Introduction 103
Our bodies contain heat 103
What gives heat? 104
How do we measure heat? 106
Expansion and contraction 112
Heat makes liquids expand 114
Heat makes things expand 114
Heat makes gases expand 116
Heat makes solids expand 117
Heat makes gases move upwards 119
Heat makes liquids move upwards 121
Conduction 123
Heat travels from one place to another 123
Convection 128
Radiation 131
Heat makes things change 133
Heat and burning 136
热 139
热是由什么提供的？ 141
导言 141
我们如何测定热量？ 142
我们的身体含有热量 143
膨胀与收缩 144
热使液体膨胀 145
热使物体膨胀 145
热使固体膨胀 146
热使气体膨胀 146
热使气体向上运动 147
热使液体向上运动 148
热从一个地方向另一个地方传递 149
传导 149
对流 151
辐射 152
热使物质发生变化 153
热与燃烧 154