two three lines return here about this words
1) Changes--
2) Contraction--
3) Evaporation--
4) Expansion--
5) Melting--
Answers
Changes:
Scientific change results in a change in the scientific explanation of the structure and functioning of nature. It, in turn, is the result of changes in the technological infrastructure within which the explanations are generated.
Contraction:
In general, all the metals expands on heating. When a substance is cooled, it shrinks in size. This process, when an object contracts on cooling, is known as contraction.
Evaporation:
Evaporation happens when a liquid turns into a gas. It can be easily visualized when rain puddles “disappear” on a hot day or when wet clothes dry in the sun. In these examples, the liquid water is not actually vanishing—it is evaporating into a gas, called water vapor. Evaporation happens on a global scale.
Expansion:
The expansion of any material is due to the kinetic energy of its atoms. When a material is heated, the increase in energy causes the atoms and molecules to move more and to take up more space— that is, to expand. This is true of even a solid such as a metal.
Melting:
One of the most important characteristics of a metal is its melting point, also known as its melting temperature. At the melting point of a metal, it is in equilibrium between its solid and liquid phases. Adding more heat to it will cause it to further liquify. Cooling it will cause it to solidify.
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