Answer; Examples of selectively permeable materials or items are; 1. Vacuum filter- it traps dust but allows air through 2. Coffee filter- allows water to pass through, but does not allow the coffee grounds. 3. Colander -used to strain liquid food from foods. it drains water but is not permeable to larger food particles.
Explanation; Selective permeability means that a material or a substance allows the passage of some molecules or ions and other materials to pass through it, and inhibits the passage of others. For example a cell membrane is semi-permeable and thus regulates the transport of materials such that some particles pass through while others can not cross. A semi-permeable membrane allows selective movement of materials, it acts like a filter that allows particles to pass or not according to their size, solubility, electrical charge, or other chemical and physical properties.
I have this question for homework as well. Colander - drains water but isn't permeable enough to lager food (used to strain liquid from food) Vacuum filter - traps dust but allows air through (used to clean) Coffee filter - allows air through (used to make coffee)
Mass is how heavy something is, volume tells you how big it is, and density is mass divided by volume. you can usually think of weight and mass as the same thing.Volume is the size of an object, and mass is its weight. Density is calculated by dividing an object’s mass by its volume. Density is sometimes used to describe other quantities divided by volume, such as energy density.
Positioning the child on the side (side-lying position) is the priority action after tonsiloectomy. It will permit the flow of secretions (like blood) from the mouth that could block the child's airway (airway patency is the priority). So, the most important thing is to maintain an open airway. Excessive coughing could actually trigger bleeding. The child will be on nothing-by-mouth status during the immediate postoperative period.
Cold air is more denser than hot air because ,when cold air of some density, say 'd' is heated, the molecules/atoms move apart from each other and so the volume expands. i hope that helped you
