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Sagot :
The difference between the new, colder temperature and the original temperature is 30 ° C.
What is temperature ?
"Temperature, measure of hotness or coldness expressed in terms of any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature). Temperature is not the equivalent of the energy of a thermodynamic system; e.g., a burning match is at a much higher temperature than an iceberg, but the total heat energy contained in an iceberg is much greater than the energy contained in a match. Temperature, similar to pressure or density, is called an intensive property—one that is independent of the quantity of matter being considered—as distinguished from extensive properties, such as mass or volume."
Given,
The old temperature is = 18°C
The new temperature is = -12°C
The difference in temperature is [tex](-12\°C - 18\°C) = 30\°C[/tex]
Hence, A is the correct option.
To know more about temperature here
https://brainly.com/question/11464844
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