In passive solar building design, windows, walls, and floors are made to collect, store, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer. This is called passive solar design because, unlike active solar heating systems, it does not involve the use of mechanical and electrical devices.[1]
[pinit] I looked on the back of a Magic Eraser package the other day and noticed there werenât any ingredients listed. That seemed very odd to me since just about every cleaning product out there has some kind of ingredient. I did a quick search and found out Magic Erasers are made of a product called melamine foam.
Two kneaded erasers. A newer eraser is on the left, and an older eraser on the right. The older eraser is darker due to the graphite and charcoal dust that has become incorporated into the eraser.Main article: Eraser. The kneaded eraser, also known as putty rubber, is a tool for artists.It is usually made of a grey or white pliable material (though it can be found in many different colors, ranging from green to blue to hot pink) and resembles putty or gum.It functions by adsorbing and picking up graphite and charcoal particles.neaded erasers are also useful for making impromptu sculptures to sketch from. Kneaded erasers are mostly used for slightly erasing but not fully erasing the content of graphite. It has great plasticity and can be molded and shaped into desired forms for ease of usage.