Salt in water, sugar in tea, sugar in water, drink powder/mix in water, sugar in coffee, etc... I hope I answered your question correctly!
The solid separates down to the molecular level - and they mix with the water molecules. We cannot see molecules with the naked eye !
A solid that has melted into a liquid and appears to disappear is undergoing a phase transition from solid to liquid. This process occurs when the solid absorbs heat, causing its molecules to move more freely and transition into a liquid state, making it seem as if the solid has vanished. An example of this is ice melting into water. The solid is still present in the liquid form, just in a different state.
When solids disappear in a liquid, they have undergone a process called dissolution, where the solid particles break apart and disperse throughout the liquid. This typically occurs when the interactions between the solid and the liquid are strong enough to overcome the forces holding the solid together. Factors such as temperature, agitation, and the nature of the solid and liquid can influence the rate and extent of dissolution. Ultimately, the solid becomes part of the solution, often resulting in a homogeneous mixture.
Hey! The reason it seems to disappear is because of the refraction and absorption of light and colour. When light enters the colourless liquid, colour is obviously absorbed. The light waves refract ("bounce") off the glass test tube and leave the glass beaker (containing the colourless liquid). Because the liquid and solid are the same colour, it creates the illusion of the test tube disappearing.
Dissolving is where the solute (solid) fills the gaps in the solvent (liquid) particles, creating a solution (a mixture of solute and solvent).
The liquid state of water in a puddle can evaporate and turn into water vapor, causing the puddle to disappear.
Evaporation - the change of liquid or a solid into vapor, giving off moisture. Or to disappear, vanish or fade
liquid
Solids do not evaporate, they Sublimate, i.e. they go directly from the solid state to a vapor. An example this process would be if you gently heat Iodine crystals, you will see purplish vapors begin to form ... it's sublimating.CAUTIONIf you try this, do it only in fume hood and with a very small sample of Iodine. The fumes are poisonous!
solid liquid
Liquid.
Solid