The salt and sugar disappeared because they dissolved in the water. Both substances are soluble, meaning they break down and spread evenly throughout the liquid, making them no longer visible as separate particles.
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The purpose of adding sugar, salt, and lemon juice to the water is to make a refreshing shikanji (lemonade) that can help rehydrate Ghulan, restore lost electrolytes, and provide a sweet, tangy flavor to quench his thirst and alleviate tiredness.
Ghulan, Sheeta, and Sara chose their hiding places based on the material properties. Ghulan hid behind a wall because it is opaque, making him completely hidden. Sheeta hid behind a big tree, another opaque object, and Sara hid behind frosted ...
When using a metal key to scratch different materials, some like wood and chalk may scratch easily due to being softer, while others like iron or stone may be much harder to scratch due to their greater hardness.
The hardness of materials is relative. For example, rubber is harder than sponge but softer than iron, indicating that hardness depends on what the material is being compared to.