Melting vs. freezing: A comparison for Grade 6 science.

📚 What is Melting?

Melting is when a solid changes into a liquid. Think of an ice cube turning into water. 🧊 This happens because the solid gets warmer, and its molecules start moving faster and faster. When they have enough energy, they break free from their fixed positions and can slide around, becoming a liquid.

📚 What is Freezing?

Freezing is the opposite of melting! It's when a liquid changes into a solid. 🥶 Imagine water turning into ice. This happens when the liquid gets colder, and its molecules slow down. They lose energy and start to stick together, forming a solid structure.

📚 Melting vs. Freezing: The Breakdown

Here's a table to compare melting and freezing side-by-side:

📚 Key Takeaways

• 🌡️ Melting and freezing are phase changes, meaning a substance changes its state (solid, liquid, gas).
• 🧊 The melting point is the temperature at which a solid turns into a liquid. For example, the melting point of ice is $0^{\circ}$C.
• 💧 The freezing point is the temperature at which a liquid turns into a solid. For water, the freezing point is also $0^{\circ}$C.
• ☀️ Melting requires energy (usually in the form of heat) to break the bonds holding the solid together.
• ❄️ Freezing releases energy as the molecules slow down and form bonds.
• ⚗️ Both melting and freezing are physical changes, meaning the substance itself doesn't change, just its state. For example, frozen water (ice) is still $H_2O$.