Endothermic Chemical Reactions. the reaction of barium hydroxide octahydrate crystals with dry ammonium chloride. dissolving ammonium chloride in water. the reaction of thionyl chloride (SOCl2) with cobalt(II) sulfate heptahydrate. mixing water and ammonium nitrate. mixing water with potassium chloride.
A gel is any liquid (usually) or gaseous medium suspended in a solid three-dimensional mesh which entraps the medium so that it does not flow. By way of (somewhat flawed analogy) think of a giant role of bubble wrap. Its mostly air. But the plastic keeps the air from flowing at a large scale.
It is permanent, non-yellowing, flexible and water-resistant when dry. String Gel is used to enhance depth of color and increase transparency and flow. This gel medium works by pouring or dripping the gel from above to create a long, string-like application. It can also be mixed with acrylic color and brushed to form long streaking effects on a surface. Available in 8 oz. jars.