ทำไมน้ำแข็งจึงลอยน้ำ
Why does ice float in water
the water level in the glass will be the same. When you put an object that is lighter than water in a cup of water the object will displace waterin the cup. The displaced water will weigh the same as the object.
The piece of ice does not change weight when it melts.
It is a little strange that the water level in a glass is the same if you add ice or add water from melted ice.