boiling point
When a liquid is heated, its temperature will continue to rise until it reaches the boiling point of the liquid. Once it reaches this temperature, further heat added to the liquid will cause it to change into a gas rather than increase in temperature.
Gases and liquids rise when heated because the increase in temperature causes the particles in the substance to gain energy and move faster, leading to a decrease in density. This causes the heated substance to become less dense than its surroundings, resulting in it rising.
This is an example of thermal expansion, where the liquid in the thermometer expands as it is heated, causing it to rise within the tube.
where the temperature is dropping or increasing! Edit: Convection is the rising and falling of heated gas.
When water is heated, the temperature increases until the boiling point. During the transition from liquid water to gaseous water (steam), the temperature does not change, and the the temperature rises again.
Rising Film EvaporatorIn a Rising Film Evaporator liquid feed enters from the bottom of steam heated tubes. The parallel movement of liquid and vapour along tube surface imparts effective water evaporation from the liquid feed. This type of evaporator is ideal for liquids which attain high viscosity or have fouling tendency.
When water is heated steadily, its temperature will stop rising when it reaches its boiling point and starts to convert into vapor. This process is known as boiling and occurs at a specific temperature depending on air pressure.
Oh come one -_-''Its obviousBubbles of vaporised liquid will formThe temperature of the liquid when boiling will remain constant even when more heat is applied.As the liquid is heated, the vapour pressure increases until it equals the pressure of the gas above it.
Liquid rises and falls when heated because when heated, liquid will expand causing it to be less dense than the other liquid around it. This results in a buoyant force and it will rise. After rising it will start to cool off since it isn't by the heat source anymore and will become more dense. This will make it more dense than the newly heated up liquid below it and so it will fall to repeat the process.
Condensation
Hot liquids rise in convection because they become less dense as they heat up, causing them to be buoyant and rise towards the surface. This creates a cycle where cooler liquid moves in to replace the rising hot liquid, setting up a convection current.
During boiling all the heat supplied to the liquid is used up in overcoming the intermolecular forces present among the molecules of the liquid. That is why the temperature of the liquid does not change.