An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change? The boiling point of the nitrogen increased. The mass of nitrogen increased. The color changed. The density changed. An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

1.The boiling point of the nitrogen increased.
2.The mass of nitrogen increased.
3.The color changed.
4.The density changed.