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Chapter 12: Problem 25

Pretend that you're talking to a friend who has not yet taken any science courses, and describe how you would explain the concept of absolute zero to him.

Short Answer

Expert verified
To explain absolute zero to a friend with no science background, I'd say: Temperature is a measure of how hot or cold something is, and at the lowest possible temperature, called "absolute zero," all movement of molecules and atoms completely stops. This temperature is roughly -273.15 degrees Celsius or -459.67 degrees Fahrenheit, and understanding absolute zero helps us learn more about how substances behave at extremely cold temperatures.

Step by step solution

01

Introduce the concept of temperature

To begin our explanation, let's talk about temperature. Temperature is a measure of how hot or cold an object is. It tells us how much heat energy there is in an object or in the air around us. We usually measure temperature using a thermometer, and we typically use degrees Celsius or Fahrenheit as units for temperature.
02

Explain the Kelvin scale

Scientists often use another unit of measurement for temperature called the Kelvin (K). The Kelvin scale was developed by a scientist named William Thomson, also known as Lord Kelvin. The main difference between the Kelvin and Celsius scales is the starting point, or the zero point. On the Celsius scale, 0 degrees represents the freezing point of water, while in the Kelvin scale, 0 K is set at a different point, which we'll discuss in the next step.
03

Describe absolute zero

Absolute zero is a theoretical temperature at which an object would have no heat energy or motion at all. This temperature is considered to be the lowest possible temperature that can be reached. At this point, all movement of molecules and atoms would stop completely. In the Kelvin scale, absolute zero is defined as 0 K. In other scales, absolute zero is equivalent to -273.15 degrees Celsius or -459.67 degrees Fahrenheit.
04

Explain the significance of absolute zero

Absolute zero is important because it helps scientists understand how substances behave at extremely low temperatures. Reaching absolute zero is considered impossible according to the laws of thermodynamics, but studying phenomena close to absolute zero has advanced our knowledge of physics and chemistry. So, to summarize, absolute zero is the lowest theoretical temperature at which all molecules and atoms would stop moving, and it is approximately equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. It is a significant concept because it helps us better understand the behavior of substances at extremely low temperatures.

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