Platinum, silver, iron, copper, and gold, are the most ductile, in the order named.
When is glass ductile?
When glass is melted it becomes ductile, and may be drawn into very fine threads.
If we take half the air out of a room, what will the remaining half do?
Its particles will separate until they fill the whole room.
What is said of air when its particles are thus separated?
The air is in a state of rarity.
What is said of it when the particles are pressed closer together?
The air is then said to be in a state of density.
Are the particles of water closer together than those of air?