Give an example from daily life which shows that the celcius temperature scale is not an absolute temperature scale.
An example from daily life that shows the Celsius temperature scale is not an absolute temperature scale can be observed when comparing the temperature inside a refrigerator and the temperature outside on a hot summer day.
To understand why the Celsius scale is not absolute, it is important to know that an absolute temperature scale, such as the Kelvin scale, has its zero point at absolute zero (-273.15°C or -459.67°F), which is the lowest possible temperature in the universe. In an absolute temperature scale, the temperature values are directly proportional to the average kinetic energy of the particles.
However, the Celsius scale is based on the freezing and boiling points of water, with 0°C being the freezing point and 100°C being the boiling point at standard atmospheric pressure. These reference points are set based on the properties of water, but they do not represent the absolute limit of temperature.
In the example of the refrigerator and the hot summer day, let's assume the temperature inside the refrigerator is set to 4°C and the outdoor temperature is 30°C. Although both values are expressed in Celsius, they do not indicate the absolute temperature. The temperature inside the refrigerator is relatively cooler compared to the outdoor temperature, but it does not mean that the kinetic energy of particles inside the refrigerator is lower than the particles outside. It's just a difference in how we perceive and measure temperature using the Celsius scale.
In conclusion, the Celsius scale is not an absolute temperature scale because its zero point is not based on the fundamental properties of matter, but rather on the freezing and boiling points of water.