Cast iron

A group of iron-carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its colour when fractured. Cast iron tends to be brittle, except for malleable cast irons.

01.01.21

Acid

An acid is a molecule or ion capable of donating a proton, (i.e. hydrogen ion, H+), (a Brønsted–Lowry acid), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). The first category of acids are the proton donors, or Brønsted–Lowry acids.

01.03.21

Boot

A boot, plural boots, is a type of specific footwear. Most boots mainly cover the foot and the ankle, while some also cover some part of the lower calf. Some boots extend up the leg, sometimes as far as the knee or even the hip.

01.05.21

Epoch

In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.

01.07.21

Cartilage

Cartilage (cartilaginous tissue) is a resilient and smooth elastic tissue, rubber-like padding that covers and protects the ends of long bones at the joints and nerves, and is a structural component.

01.10.21