What is U value of insulation?

What is U value of insulation? A U-value is a sum of the thermal resistances of the layers that make up an entire building element – for example, a roof, wall or floor. It also includes adjustments for any fixings or air gaps. Is it better to have a higher or lower thermal conductivity? A […]

Why is NO2 not a greenhouse gas?

Why is NO2 not a greenhouse gas? Neither nitric oxide nor nitrogen dioxide are greenhouse gases, although they are important in the process of creation of tropospheric ozone which is a greenhouse gas. Because of this, there is general agreement that the atmospheric sources and sinks of nitrous oxide are difficult to bring into balance. […]

How do igneous rocks look like?

How do igneous rocks look like? Extrusive, or volcanic, igneous rocks look dull and do not sparkle much because they are fine grained. These crystals make a coarse-grained igneous rock called plutonic, or intrusive, igneous rock because the magma was intruded into cracks deep under the earth’s surface. What type of rock is granite? Granite […]

What is the intensity of UV light?

What is the intensity of UV light? The intensity of UV radiation is measured in the units of milliwatts per square centimeter (mW/cm2) which is energy per square centimeter received per second. Also, it is measured in the units of millijoules per square centimeter (mJ/cm2), which is energy received per unit area in a given […]

Can a tuning fork go out of tune?

Can a tuning fork go out of tune? No, you can’t whack a fork too hard and make it ring out of tune! It will have been like that from the factory. You can re-tune a fork that is flat by grinding of some material from the ends of both forks. grind it a tiny […]

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