건습구습도계 Psychrometer(hygrometry)


A hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer. Dry-bulb is a ordinary thermometer. And wet-bulb is the thermometer with wet sock. Thus, wet-bulb measured a little lower due to the evaporation heat. Their difference indicates the dryness…
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화성암 Igneous Rock

Classification of igneous rocks

Igneous rocks are rocks formed from molten magma. The material is made liquid by the heat inside the Earth’s mantle. Igneous rock occurs in two ways. Slow cooling : Igneous rock formed from magma that has become solid inside the…
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압력과 면적의 관계 Pressure and Pressing Area

Pressure and Pressing Area

Pressure is defined as force per unit area. It is usually more convenient to use pressure rather than force to describe the influences upon fluid behavior. The standard unit for pressure is the Pascal, which is a Newton per square…
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