K, k, ケー, ケイ
1. K
See キロ・1
2. kilo-
See ケルビン
3. kelvin
See カラット・2
4. karat (measure of purity of gold), carat
See カリウム
5. potassium (K)
は
Particle, pronounced わ in modern Japanese
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis