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T HE E FFECT OF T EMPERATURE AND S OLUTE C ONCENTRATION ON D IFFUSION AND O SMOSIS B RYAN M C C ARTHY Mollick explains that diffusion is “the passive movement of molecules or ions from areas of greater concentration of those molecules or ions to areas of lesser concentration.” He also explains that osmosis is “the diffusion of water molecules through a selectively permeable membrane.” These terms are key in order to understand how we should keep ourselves hydrated. Many different factors affect these processes such as temperature and solute concentration. Mollick says that kinetic energy tends to move any solute molecules in the water from areas of high concentration to areas of lesser concentration. Kinetic energy is greater at higher temperatures. My hypothesis therefore is that if the temperature is higher then the rate of diffusion will also be higher. There are studies that report faster gastric emptying in more dilute solutions (Smith). My hypothesis is that if solute concentration is lessened in a solution then the rate of osmosis will be greater. MATERIALS AND METHODS E FFECT OF TEMPERATURE ON RATE OF D IFFUSION – In this study, three tubes of yellow gel agar were obtained and marked for identification. A 900mL ice-water bath was made and its temperature
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