1. Since you can pour sand into a cup, why it is not a liquid?
2. Why is water could exist in the three states of matter?
3. You can't usually see gases in the air. How can you observe gases without seeing
them?
4. Does air have mass? Explain.

1.Sand is a solid because each grain of sand is just a very small solid that can hold its shape. When it is poured, the small grains of sand pile up on each other to form a small hill and not a flat surface. Furthermore, it does not completely fill the container like a liquid.

2.Water is unique because the properties of water allow it to exist in all three states of matter! Water is usually a liquid, but when it reaches to 32° Fahrenheit (F), it freezes into ice. ... (Steam is the gas state of water, and is also called water vapor.)

3.How can you observe gases without seeing them? You can feel the wind blow. You can observe air movement, such as a waving flag or a turning windmill. You can also observe temperature and humidity changes in the air

4.Matter is anything that has mass and takes up space. ... Although air has mass, a small volume of air, such as the air in the balloons, doesn't have too much. Air just isn't very dense. We can show that the air in the balloon has mass by building a balance.

Leduyvan1988go Leduyvan1988go · Answer 2

Answer:

1. Sand is a solid because each grain of sand is just a very small solid that can hold its shape. When it is poured, the small grains of sand pile up on each other to form a small hill and not a flat surface. Furthermore, it does not completely fill the container like a liquid.

2.Water is unique because the properties of water allow it to exist in all three states of matter! Water is usually a liquid, but when it reaches to 32° Fahrenheit (F), it freezes into ice. ... (Steam is the gas state of water, and is also called water vapor.)

3. We can't see gases in the air but we can observe it because when we inhale air we inhale oxygen gas but you can also give diagram of albert einstein.

4. Although air has mass, a small volume of air, such as the air in the balloons, doesn't have too much. Air just isn't very dense. We can show that the air in the balloon has mass by building a balance.