gas - to detect the amount of carbon monoxide coming from a fire, light - controlling automatic headlights on a car, moisture - monitoring the soil conditions in a greenhouse, pressure - monitoring an automatic door, pH - checking to see if blood is starved of oxygen, motion - to detect the movement of a person playing a computer game, temperature - checking that food is safe to eat, humidity - can be used to predict the weather, magnetic field - to avoid metal objects coming into contact with each other,

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