Increases the rate of diffusion: Using boiling hot water to make a cup of tea., Some teabags have a pyramid shape to increase surface area., Spraying a lot of deodorant to create a greater concentration., The intestines have many folds to create a larger surface area., Your body temperature is usually warmer than your surroundings., Your lungs contain many tiny alveoli to increase the surface area., Decreases the rate of diffusion: Some teabags are flat and have a small surface area., Making Ribena with ice in the glass to lower the temperature, If you suffer hypothermia (when your core body temperature drops too low), If there is a low concentration of sugar in your bloodstream., You have held your breath for a long time so the concentration gradient in your lungs is small., Trying to diffuse coffee into an ice cold latte drink.,

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