Before you read this, I suggest that you read posts 16.34 and 16.35. We all have everyday experience of solids, liquids and gases. We can hit things with solids but may need to be careful that they don’t break. We need to keep liquids in a cup, jar, bottle or similar container. Liquids differ from… Continue reading 16.37 Solids, liquids and gases

“Good” and “bad” are subjective words – what seems “good” to one person may seem “bad” to another. Science works because it attempts to eliminate subjective opinions and to be as objective as possible (see post 16.22). So we need to be careful to avoid thinking about something as being “good” or “bad” and define… Continue reading 16.36 Good and Bad

Before you read this, I suggest you read posts 16.21 and 16.34. Suppose you blow air into a balloon until it is partly inflated. If you put the balloon somewhere warmer (at a higher temperature), it will inflate itself even more. When you put the balloon somewhere warmer, heat spontaneously flows into it (see post… Continue reading 16.35 Heat

Before you read this, I suggest you read post 16.21. Let’s think about two identical steam engines; each contains water at the same temperature (100oC) at which water boils. The only difference is that one boiler is full and the other is only half full. Which of the two engines is capable of doing most… Continue reading 16.34 Temperature