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Colloidal silica gel with light opalescence. Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum.
Canisters are commonly filled with silica gel and other molecular sieves as desiccants in drug containers to keep contents dry Silica gel in a sachet or porous packet. A desiccant is a hygroscopic substance that is used to induce or sustain a state of dryness (desiccation) in its vicinity; it is the opposite of a humectant.
Amazon Basics Cooling Elevated Dog Bed $29.14 at Amazon. One of our favorite outdoor dog beds, this raised bed lifts dogs more than 7 inches off the ground and it’s lightweight enough to move ...
Electric lawn mower in grass-cycling mode. Grasscycling is a method of handling grass clippings by leaving them to decompose on the lawn when mowing.The term combines "grass" and "recycling", and had come into use by at least 1990, [1] as part of the push to reduce the huge quantities of clippings going into landfills, up to half of some cities' summertime waste flow, [2] as 1,000 square feet ...
An ice pack or gel pack is a portable bag filled with water, refrigerant gel, or liquid, meant to provide cooling. They can be divided into the reusable type, which works as a thermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can only be used once.
The lowest-density silica nanofoam weighs 1,000 g/m 3, [58] which is the evacuated version of the record-aerogel of 1,900 g/m 3. [59] The density of air is 1,200 g/m 3 (at 20 °C and 1 atm). [60] The silica solidifies into three-dimensional, intertwined clusters that make up only 3% of the volume. Conduction through the solid is therefore very low.
When heated they lose water to form silica gel, an active form of silicon dioxide.. Neither article lists the actual chemical formula for silica gel. Only the previous blurb in the silicic acid article comes close. Thus, it remains unclear what the actual chemical formula is. My guess from the silicic acid line would be: SiO 2. Either way, the ...
The smell of freshly cut grass is an odour caused by green leaf volatiles (GLVs) released when it is damaged. Mechanical damage to grass from activities such as lawnmowing results in the release of cis -3-hexenal and other compounds that contribute to a grassy or "green" smell.