Z is for ZERO (or rather, below ZERO)

Zero of course relates to the freezing point of water in the most commonly used temperature scale, known as the Celcius scale:

Celsius (also historically known as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval

From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere.^{[citation needed]} Although these defining correlations are commonly taught in schools today, by international agreement the unit "degree Celsius" and the Celsius scale are currently defined by two different points: absolute zero, and the triple point of VSMOW (specially prepared water). This definition also precisely relates the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature (symbol: K). Absolute zero, the hypothetical but unattainable temperature at which matter exhibits zero entropy, is defined as being precisely 0 K and −273.15 °C. The temperature value of the triple point of water is defined as being precisely 273.16 K and 0.01 °C.^[1]

Now that Wikipedia has told us this, we can return to see what below Zero means in practice. - snow, ice and frost mist. These phenomenons have been widely observed in the Northern hemisphere during the last weeks. Above are two examples shot right after sunrise, and below is one shot a little later in the day. The last one was shot at -18 C - on the coast.

Today's post is an entry in the FIFTH round of ABC Wednesday, the meme initiated by Denise Nesbitt.

For more, you can log on via the MckLinky enabled site