> In which type of matter are particles packed together the tightest?And the answer: solid. In a solid, particles are tightly packed, usually in a regular pattern, whichhelps the solid retain a fixed volume and shape. In contrast, particles inliquids and gasses are farther apart and flow more easily, with the liquid andgas taking on the shape of the container they're in.Image credit: Socratic.orgAlthough matter can not be created or destroyed, itcertainly can change shape. Solids, liquids and gasses are the forms of matterthat comprise our universe (although scientists have recently discovered how tocreate three more forms of matter: plasmas, Bose-Einstein condensates, andfermionic condensates). Each of the three common forms of matter behave in apredictable fashion: solids firmly hold their shape, gasses are free-flowing,and liquids take on the shape of their container. However, there are someinteresting exceptions to these rules. Learn something new about solids, liquidsand gasses below: 1. When helium is cooled to almost absolute zero – the lowest temperature possible – it becomes a liquid with surprising properties. It can flow against gravity and will start running up and over the lip of a glass container. 2. Due to incredibly high pressure on the planets Uranus and Neptune, it's theorized that oceans of liquid diamond exist on the surface of each planet, with solid "diamond-bergs" floating on the surface. (Doesn't sound like a bad vacation, if you get past all the poisonous gasses.) 3. There are quite a few types of gasses. Pure gasses are made up of just one atom, such as neon. Elemental gasses are made up of two or more of the same atoms that have joined together, such as hydrogen. 4. Although solids are firm objects, they can possess changeable qualities. Plenty examples of this are common in everyday life: clay, Play-Doh, and other putties are examples of malleable solids. Learn more about solids, liquids and gasses here[https://parenting.firstcry.com/articles/facts-about-states-of-matter-for-kids/].