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Yogita Ingle 7 years, 4 months ago
| Solid | Liquid | Gases |
| Solid has fixed volume. | Liquid has definite volume. | Gas has no fixed volume. |
| Solid has fixed shape. | Liquid has no definite shape. | Gas has indefinite shape |
| Solid has high density. | Liquid has less density compare to solid. | Gas has very low density. |
| Solids are heavy. | Liquid is lighter than solid. | Because of low density gas are light. |
| Solid does not flow. | Liquid flows and hence is called fluid . | Gas can flow easily and hence are called fluid. |
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The different means by which infectious diseases spread are:
(i) By direct contact between a healthy and an infected person.
(ii) By indirect contact between a healthy and an infected person.
(iii) Through air.
(iv) Through food.
(v) By vectors such as mosquitoes and insects, etc.
(vi) By the bite of a rabid animal.
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Yogita Ingle 7 years, 4 months ago
The principle of fractional distillation is that different liquids boil at different temperature. The miscible liquids boil at different temperature and evaporate at different temperature.
When the mixture is heated, the liquid with lower boiling point boils and turns into vapours. So the mixture is heated to a temperature at which one or two components of the mixture will vaporise. Fractional distillation involves repeated distillations and condensations.
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| Homogeneous mixture | Heterogeneous solutions |
| All solutions are the examples of homogeneous mixture. | Most of the mixtures are heterogeneous except solutions and alloys . |
| The particles of a homogeneous mixture are less the one nanometer. | The constituent particles are present uniformly in a heterogeneous mixture. |
| A homogenous mixture does not show Tyndall effect. | Heterogeneous mixtures show Tyndall effect. |
| The boundaries of particles cannot be differentiated. | Generally, two or more phases are present in a heterogeneous mixture. |
| The constituent particles of homogenous mixture cannot be separated using centrifugation or decantation. | Particles of a heterogeneous mixture are sized between one nanometer and one micrometer or more. |
| Alloys are the examples of solution. | The components of a heterogeneous mixture can be identified easily. |
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Yogita Ingle 7 years, 4 months ago
T = time
a = acceleration
v = velocity
u = initial velocity
a = (v-u)/t
at = v-u
at + u = v
Therefore v = u + at
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