A helium balloon displaces the amount of air. The weight of the helium in the balloon + the balloon fabric = lighter than the air that it displaces. Helium is lighter than air, so therefore, if it's in a balloon, the balloon will float.
When a substance goes from being a liquid to a gas it evaporates, or boils away. Think of boiled eggs.
Physical changes are when things get changed without altering chemical consistencies, which is melting solid butter into liquid one, or boiling water. Chemical changes are things such as caramelizing sugar when making sweets, or when carbon dioxide is created and released when baking bread.
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Misalnya organ itu adalah kedua tangan kita,maka keadaan suatu manusia tsb tdk akan mempunyai kedua lengannya dan otomatis ia jg sulit untuk melakukan aktivitas sprti: makan,minum,mengambil sesuatu,menulis,dll
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