This statement about the giraffes is a logical fallacy called hasty generalization.
The boy thinks that if one giraffe was friendly to him, that all giraffes are bound to do the same - he is generalizing something that doesn't have to be correct.
Answer:
President Lincoln is reminding people that although the ceremony was dedicated to those fallen on one battlefield and their achievements in victory that the Civil War was continuing and there was more to be done.
The method of heat transfer that does not require a medium is radiation. Heat may be transmitted across void space through thermal radiation, commonly known as infrared radiation.
No mass is transferred and no medium is required during radiation. Radiation is the only method of heat transmission that does not need a substance, such as the heat released by the sun or the filament of a light bulb. There is no material medium necessary for the propagation of electromagnetic waves, often known as radiation. Only in a vacuum can we observe the perfect transfer of energy, because when radiation travels through material, part of its energy is lost. (Subject to the material property)
Conversely, in the instance of Conduction.
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