Water,
wax, lead and salt are examples of substances.
A substance has an exact melting point –
a particular temperature where it changes from solid to liquid.
Solid and liquid are two possible states
a substance can be in.
• If a sample of a substance is above its
melting point it will be in the liquid
state.
• If a sample of a substance is below its
melting point it will be in the solid state.
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