It dissolves
When a cube of sugar is dropped in a cup of solvent like water or milk the molecules of sugar start diffusing from its block to the solvent by their own kinetic energy so as to make a uniform solution of the solute (sugar) and the solvent (water or milk).
decrease,because the cube of sugar absorb some heat
No, it wouldn't. a sugar cube would melt a lot faster in a cup of Hot water. the hot water helps it desolve more evenly than cold water.
The sugar cube in the hot water will dissolve faster because there are more and higher energy collisions between the water molecules and the sugar molecules which will cause the sugar to dissolve faster.
Eat dik
The process is called dissolution. It involves the sugar particles becoming dispersed in the water, forming a sugar-water solution.
One sugar cube is equal to one teaspoon or 1/48th of a cup. (Source: http://wiki.answers.com/Q/What_quantity_of_sugar_is_in_a_cube) There are 200g of sugar per cup. (Source: http://en.wikipedia.org/wiki/Sugar) The math yields the answer: There are 4.17g of sugar per cube of sugar.
a sugar cube
No they are not!! well, basically ya no because if you put a sugar cube in a cup of water what does it make? It makes a solution.
Sugar water
One sugar cube is equal to one teaspoon or 1/48th of a cup.
I cup