Quick Answer: Why does temperature remain constant during boiling?

When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. … In addition, gas molecules leaving the liquid remove thermal energy from the liquid. Therefore the temperature of the liquid remains constant during boiling.

Why does the temperature remain constant during boiling Class 9?

During the boiling of water the temperature stays constant while heat is supplied continuously. It is because the heat provided by the water particles is consumed, and this heat increases their kinetic energy. … Therefore, the temperature stays constant only though heat is continually supplied to the water.

Why the temperature remains constant during melting and boiling?

The extra heat supplied is used in the melting of ice which is called the latent heat of fusion. Similarly, when a liquid starts boiling the temperature of the liquid does not change instead of a continuous supply of heat. … That’s why the temperature of a substance remains constant during its melting or boiling.

Why the temperature does remain constant?

It is due to the latent heat as the heat supplied to increase the temperature of the substance is used up to transform the state of matter of the substance hence the temperature stays constant. Hence the temperature remains constant as all the heat is used up and no external heat is released or absorbed.

What produces more severe burns boiling water or steam?

– Now, as water is in a gaseous state in steam, it can be given further heat and its temperature will increase, so steam always has higher temperatures than boiling water. Hence we can say that steam produces more severe burns than boiling water.

At what stage the temperature will become constant for some time although heating is continued?

1) the temperature of water does not rise continuously if heat is supplied to it. 2) when it reaches its boiling point (100 deg celcius) the temperature remains constant for some time.

Why the temperature does remain constant when a solid starts melting?

The ‘temperature of a substance’ remains constant during its melting and boiling point because the change in any state of matter as n solid to liquid or the liquid to a gas involves crossing the ‘latent heat of fusion’ which causes a change in the intermolecular spacing of the molecules in the substance.

Does the temperature change at the melting and boiling points?

As with melting, the energy in boiling goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. So boiling is also an isothermal process. Only when all of a substance has boiled does any additional energy go to changing its temperature.

Why does temperature not increase when state is changing?

During a change of the state of matter, the supplied energy is not used to increase the kinetic energy of the molecules, but to change the binding energies. Therefore, the temperature remains constant.

When the temperature is increased What does not change?

The change of phase always occurs with a change of heat. However the temperature does not change. When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, and thereby its temperature increases.

Why does temperature not change during melting?

Energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart so that the molecules can move around at comparable kinetic energies; thus, there is no rise in temperature. … There is no temperature change until a phase change is complete.

Why does steam hurt more than boiling water?

Steam causes more severe burns.

It possesses the additional latent heat of vaporization. So, when steam falls on skin and condenses to produce water it gives out 22.5 x 10⁵ J/kg more heat than boiling water at the same temperature. … Therefore, burns produced by steam are more severe than those produced by boiling water.

Which will cause severe burn?

A burn is damage to your body’s tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke.

Is steam hotter than boiling water?

The steam is no hotter than the water but it contains more usable heat energy per gram, and it can release that heat as it encounters a cooler medium and makes the phase-change back to water.