Question

The temperature on the Celsius scale where all molecular activity stops is?

1) Absolute zero
2) Boiling point of water
3) Freezing point of water
4) Room temperature

Answer 1

Absolute zero is the temperature at which all molecular motion stops, and it is -273.15°C on the Celsius scale and 0 K on the Kelvin scale.

Step-by-step explanation:

The temperature on the Celsius scale where all molecular activity stops is known as absolute zero. Absolute zero represents the lowest possible temperature, at which point the molecular motion of substances ceases entirely. This is a critical concept in understanding the behavior of gases and the nature of heat and temperature. On the Celsius scale, absolute zero is at -273.15°C, which is equivalent to 0 K on the Kelvin scale. The Kelvin scale is particularly important in areas such as astronomy and physics because it starts at this theoretical lower limit of temperature.

For reference, the freezing point of water on the Celsius scale is 0°C, and the boiling point is 100°C. Note that the Kelvin and Celsius scales are directly related; a difference of one degree Celsius is equivalent to a difference of one kelvin.

Although it's a fundamental limit in thermal physics, reaching absolute zero is not physically possible, as substances tend to liquefy and then freeze before this temperature is attained.