Isotropy and anisotropy: When a material is attacked by a liquid or vapor etchant, it is removed isotropically (uniformly in. all directions) or anisotropic etching (uniformity in vertical direction).
Some Questions Do Remain: 1  If the Earth was flat, we could travel to the place where the Earth and sky met. But we canât. 2  If the Earth was flat, we could reach the place where we could reach out and touch the Sun. But we canât. 3  If the Earth was flat, we could fall off the horizon. But we donâ 4 t. If the Earth was flat, it would simply fall.
Flat is usually a noun or an adjective, but it is sometimes an adverb. 1. 'flat' used as a noun. In British English, a flat is a set of rooms for living in, usually on one floor of a large building. ...a ground floor flat. See flat-apartment. 2. 'flat' used as an adjective or adverb. Something that is flat is not sloping, curved, or pointed. Every flat surface in our house is covered with junk. Use a saucepan with a flat base. If something lies or rests flat against a surface, all of it is touching the surface. He was lying flat on his back. She let the blade of her oar rest flat upon the water.