what is the definite melting point and boiling point indicate with regards to a matter
Answers
Answer:
Explanation:
The melting point is usually defined as the point at which materials changes from a solid to a liquid.
The temperature at which solid changes its state to liquid at atmospheric pressure is called the melting point of that liquid. This is the point at which both liquid and solid phase exists at equilibrium. The melting point of the substance also varies with pressure and is specified at standard pressure.
The term ‘freezing point’ is used to denote the temperature at which a liquid is converted into a solid and can, therefore, be viewed as the opposite of the term ‘melting point’. However, substances can be cooled below their freezing points without the formation of a solid. Such liquids are known as supercooled liquids.
The boiling point of the liquid depends upon the pressure of the surrounding. When the liquid is at high pressure, it has a higher boiling point than the boiling point at normal atmospheric pressure. The boiling point of different liquids is different for a given pressure. In 1982, IUPAC defined the standard boiling point of a liquid as the temperature at which the liquid boils under a pressure of 1 bar.
Boiling Point Definition
The temperature at which liquid vapor pressure equals atmospheric pressure is referred to as boiling point. The boiling point is defined as the temperature at which a liquid’s saturated vapor pressure equals the atmospheric pressure surrounding it.
The boiling point for any material is the temperature point at which the material transforms into the gas phase in the liquid phase. This happens at 100 degrees centigrade for water. The Celsius scale was in fact created on the basis of the ice / water melting point and the liquid water / vapor boiling point. Each substance carries its own boiling point.
The boiling point of a substance is dependent on the pressure of its surroundings. In mountainous terrains (where the altitude is high), the pressure of the atmosphere is relatively lower than the atmospheric pressure at sea level. This is the reason why food cooks at a slower pace in mountainous areas (the lower atmospheric pressure causes water to boil at temperatures below 100oC).
When all the particles in the liquid phase have been transformed into the gas phase, the temperature begins to rise again, as long as heat is still being applied to the surrounding system. As the temperature starts to increase, so does the particle’s kinetic energy.
The temperature at which liquid vapor pressure equals atmospheric pressure is referred to as boiling point. The boiling point is defined as the temperature at which a liquid’s saturated vapor pressure equals the atmospheric pressure surrounding it.
The boiling point for any material is the temperature point at which the material transforms into the gas phase in the liquid phase. This happens at 100 degrees centigrade for water. The Celsius scale was in fact created on the basis of the ice / water melting point and the liquid water / vapor boiling point. Each substance carries its own boiling point.
The melting point is determined in a capillary tube. The temperature at which the substance is completely melted as indicated by the disappearance of the solid, will be in the range of + or – 4oC from the stated value, unless otherwise indicated.