yes

Dr Robert A Phillips thank you for your contribution to the discussion

Stirring will help cool a hot drink because it speeds up the process of convection by bringing the hottest liquid at the bottom to the top, where it can be cooled by the air. No, stirring distributes heat. Consider a cup of coffee the sides of the cup are cold and so they cool the liquid that touches them. The liquid in the center will be hotter that near the sides; there will be convection currents. A water pot is small and non viscous, therefore the convection inside is strong enough to ensure that the heating is uniform. Therefore, stirring it won't change the time to boil it, in itself. But stirring it will prevent to cover the boiling pot.If you vigorously stir cold water you might get it to warm up if it was well insulated - duplicating Joule's clasic Mechanical equivalent of heat experiment. But if you stir a cup of hot coffee or a pot of hot water the far more significant effect it that the stirring accelerates cooling. Stirring a liquid also lessens the chances of bumping, as the resulting vortex breaks up any large bubbles that might form, and the stirring itself creates bubbles. The solubility of a given solute to dissolve in a specific solvent depends on the temperature. With an increase in temperature solubility of liquids and solids increases. In the same way solubility of gases decreases with an increase in temperature. The higher the temperature the easier a solid will dissolve. The lower the temperature the harder it is for a solid to dissolve. This is because the heat 'excites' the solvent making it easier for it to break apart/ split away from each other. The higher the temperature increases there is a decrease in gas solubility. As the temperature of the solution increase, the average kinetic energy of the solute molecules also increases. This causes the molecules to be less able to hold together and hence they dissolve more readily. Hence increase in temperature increases the solubility of solid states. The solute's solubility falls because the kinetic energy of the gaseous solute increases as the temperature rises. As a result, its molecules are more likely to escape the solvent molecule's attraction and return to the gas phase. When the temperature of solid increases the kinetic energy also increases. The particles inside start moving with a great speed and the solid get converted into liquid. An increase in temperature puts a stress on the equilibrium condition and causes it to shift to the right. The stress is relieved because the dissolving process consumes some of the heat. Therefore, the solubility (concentration) increases with an increase in temperature. If the process is exothermic. However, there are a few salts like cerium sulphate, lithium carbonate and sodium carbonate monohydrate, etc. whose solubility decreases with the increase in temperature.

Yes, stirring increases heat transfer and the relationship between temperature and solubility of a solid.

• Stirring increases heat transfer. When you stir a liquid, you are moving the solvent molecules around, which increases the surface area of the solvent that is exposed to the solute. This allows more heat to be transferred from the solvent to the solute, which speeds up the dissolution process.
• Temperature and solubility are directly related. In general, the higher the temperature of the solvent, the more solute will dissolve in it. This is because the solvent molecules have more kinetic energy at higher temperatures, which makes them more likely to collide with the solute molecules and break them apart.

So, stirring increases heat transfer, which speeds up the dissolution process. And, because temperature and solubility are directly related, increasing the temperature of the solvent also speeds up the dissolution process.

Here are some examples of how stirring and temperature affect the solubility of a solid:

• Sugar dissolves faster in hot water than in cold water.
• Salt dissolves faster in hot water than in cold water.
• Coffee grounds dissolve faster in hot water than in cold water.

In all of these cases, stirring will help to speed up the dissolution process even further.

Dr Murtadha Shukur thank you for your contribution to the discussion

The solubility of a given solute to dissolve in a specific solvent depends on the temperature. With an increase in temperature solubility of liquids and solids increases. In the same way solubility of gases decreases with an increase in temperature. The higher the temperature the easier a solid will dissolve. The lower the temperature the harder it is for a solid to dissolve. This is because the heat 'excites' the solvent making it easier for it to break apart/ split away from each other. The higher the temperature increases there is a decrease in gas solubility. As the temperature increases, the solubility of the solid particles also increases. This happens because, with the increase in temperature the kinetic energy of the molecules rises, making the solute molecules easy to break apart, and thus dissolve with the solvent. For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions. Heating up a solvent gives the molecules more kinetic energy. The increased rapid motion means that the solvent molecules collide with the solute with greater frequency, and that the collisions occur with more force. Both factors increase the rate at which the solute dissolves. An increase in temperature puts a stress on the equilibrium condition and causes it to shift to the right. The stress is relieved because the dissolving process consumes some of the heat. Therefore, the solubility increases with an increase in temperature. Solubility of a solid in water always increases with increase in temperature. The solubility of most solids in liquids increases as the temperature increases. At higher temperatures, the solvent molecules have a higher kinetic energy which means that they can break the forces that hold the solute molecules together more easily. This results in a higher solubility. When the temperature of solid increases the kinetic energy also increases. The particles inside start moving with a great speed and the solid get converted into liquid. Stirring will help cool a hot drink because it speeds up the process of convection by bringing the hottest liquid at the bottom to the top, where it can be cooled by the air. No, stirring distributes heat. Consider a cup of coffee: the sides of the cup are cold and so they cool the liquid that touches them. The liquid in the center will be hotter that near the sides; there will be convection currents.Heat is transferred mostly by conduction from the hot surface of the pan or wok through a thin layer of hot oil. So, the surface temperature of vegetables rises rapidly and a proportion of water is vaporized.