What is explosion testing?

What is explosion testing? A combustible gas or vapor forms an explosive gas (vapor)/air mixture with a certain mixing ratio, and the mixture explodes in the presence of a certain ignition source. Explosion can be prevented by eliminating one of three combustion elements, namely fuel, air (oxygen), and ignition source. Read more…

O que e ser teimoso?

O que é ser teimoso? 1 Que é excessivamente insistente; que teima com frequência; birrento, obstinado, persistente, revel, tenaz, tungador: É uma criança muito teimosa; quando quer alguma coisa chega a cansar de tanto insistir. 2 Que se recusa a ceder; cabeça-dura, turrão: Ela é teimosa demais para admitir que Read more…

What is a phonics lesson?

What is a phonics lesson? Phonics instruction teaches common letter-sound relationships, including sounds for common letter patterns, so that readers can apply them in decoding unfamiliar words. What order should I teach phonics skills? As we stated on our Keys to Success page, phonics instruction must be systematic and sequential. Read more…