Celsius

(noun)

A scale and unit of measurement for temperature where 0 °C is the freezing point of water. Also known as centigrade.

Related Terms

Examples of Celsius in the following topics:

  • Temperature

    • Anders Celsius proposed a 100 degree scale for the difference between freezing and boiling of water, and after a few minor adjustments, the Celsius, or centigrade, system was also widely adopted.
    • Using the Celsius system for its measurement of degrees, Lord Kelvin calculated the ultimate cold temperature to be -273 °C.
    • Conversion tables can be used to convert a measurement to any scale from any other temperature scale, such as kelvin or Celsius.
    • Use the equations in this table to convert temperatures to the Celsius measurement system.
    • Celsius is a scale and unit of measurement for temperature where 0 °C is the freezing point of water.

  • Solid Solubility and Temperature

    • This chart shows the solubility of various substances in water at a variety of temperatures (in degrees Celsius).
    • Notice how NaCl's solubility is relatively constant regardless of temperature, whereas Na2SO4's solubility increases exponentially over 0–35 degrees Celsius and then abruptly begins to decrease.

  • The Structure and Properties of Water

    • It is in dynamic equilibrium between the liquid and gas states at 0 degrees Celsius and 1 atm of pressure.
    • At room temperature (approximately 25 degrees Celsius), it is a tasteless, odorless, and colorless liquid.
    • Water is primarily a liquid under standard conditions (25 degrees Celsius and 1 atm of pressure).
    • The inset shows the curve in more detail in the range of 0-10 degrees Celsius.
    • Liquid water is most dense at 4 degrees Celsius.

  • Energy Changes in Chemical Reactions

    • When water is heated to over 2000 degrees Celsius, a small fraction will decompose into hydrogen and oxygen.

  • Environmental Problems Associated with Fossil Fuel Use

    • The graph shows an increase of about 1 degree Celsius since 1910.

  • Boiling & Melting Points

    • The formula of each entry is followed by its formula weight in parentheses and the boiling point in degrees Celsius.

  • Standard Units (SI Units)

    • The incremental size of the kelvin is the same as that of the degree on the Celsius (also called centigrade) scale.

  • Hydrogenation

    • Generally, hydrogenation reactions will not occur between hydrogen and organic compounds below 480 degrees Celsius without metal catalysts.

  • Heating Curve for Water

    • Solid ice is heated and the temperature increases until the normal freezing/melting point of zero degrees Celsius is reached.

  • Free Energy Changes in Chemical Reactions

    • Water below zero degrees Celsius undergoes a decrease in its entropy, but the heat released into the surroundings more than compensates for this so the entropy of the world increases, the free energy of the H2O diminishes, and the process proceeds spontaneously.