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Accessibility View hot-air-balloon-wallpaper-hd-48994-50642-hd-wallpapers.jpg Stage 1 - Fluids (2023) Formative Objective: Describe fundamental characteristics of fluids through the concepts of density, weight density and pressure. Understand Pascal’s and Archimedes’ Principles through their equations and stating real life examples. Fluids and density A fluid is a collection of molecules that are randomly arranged and held together by weak cohesive forces and by forces exerted by the walls of a container. Fluid mechanics is the branch of physics that studies fluids and the forces acting on them. Both liquids and gases are fluids. The mass density or density of a substance is defined as its mass per unit volume. It is the “lightness“ or “heaviness” of materials of the same size. 5.png6.jpg Eureka 25 - Volume & Density.mov Pressure in solids Pressure is a force divided by the area over which the force is exerted. Pressure is a scalar quantity. 8.pngc0415755-400px-wm.jpg Physics project: Balloon on bed of nails A balloon being pressed on a bed of nails does not burst so quickly. The greater the number of nails, the larger the contact area and so the less the pressure exerted. http:/...