When water is heated from 0°C to 10°C, its volume first decreases and then increases.

Water is a unique substance that exhibits a phenomenon called anomalous expansion. Most substances contract when cooled and expand when heated, following a linear relationship between temperature and volume. However, water behaves differently within a certain temperature range.

As water is cooled from its maximum density point at 4°C (approximately), it contracts and becomes denser until it reaches 0°C. Upon further cooling below 0°C, it expands due to the formation of ice crystals.

When water is heated from 0°C to 10°C, it initially continues to contract and become denser until it reaches approximately 4°C. After that, it starts to expand, leading to an increase in volume.

Therefore, when water is heated from 0°C to 10°C, its volume first decreases and then increases.