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Summaries · Grade 4 Natural Sciences › Melting point and reading graphs
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Melting point and reading graphs

What a melting point is, and how to read a bar graph of melting points. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Melting points

Ice0 °CChocolate34 °CCandle wax60 °CLead327 °C
Each substance melts at its own temperature.

Above its melting point a solid becomes a liquid. Water at −10 °C is ice; at 50 °C it is liquid. Because each substance has its own melting point, it helps us identify substances.

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Reading a bar graph

  1. Read the heading: what does the graph show?
  2. Read the axes: the up-and-down axis shows the amount (°C); the side-to-side axis shows what is compared.
  3. Compare the bars: the longest bar has the highest melting point.
Rule

Always read each bar’s value off the axis. If the axis starts at 0, a bar twice as long has a value twice as big.

Ice, butter and chocolate melt at different temperatures.
Ice, butter and chocolate melt at different temperatures.
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Melting safely

Melt chocolate with gentle heat, in a bowl over warm water. Heat (energy) makes it melt.

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Remember this and test yourself

Remember this: your summary
  • The melting point is the temperature at which a substance melts. We measure it in degrees Celsius (°C).
  • Ice melts at 0 °C; water boils at 100 °C.
  • A low melting point melts easily (butter); a high melting point is hard to melt (iron).
  • While ice is melting, the temperature stays at 0 °C.
  • Read a graph: first the heading and the axes; the longest bar has the biggest value.

Write these points in your book. Read them again the night before the test.

Memory trick

Low melts soon (butter in your hand); high never melts in the kitchen (iron).

Flash cards · Tap to turn over

Important words

First say what the word means, then turn the card over.

Test yourself · Part 2

True or false?

Read the question and the answer. Is the answer right? Tap True or False.

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