Many people wonder about the total number of elements present in the Earth’s crust. The right answer to this question is around 118 elements according to the periodic table. There are about 94 elements that are naturally occurring while the remaining are said to be the trans-uranic elements or artificial elements, which are synthesized in…
Ultra Violet light or UV rays is an electromagnetic radiation naturally emitted by the sun. It is also radiated by specially created light like the black light. The UV wave length is shorter than the visible light. A UV wavelength determines how long the wavelength of a particular light is. It is measured in nano…
Weather is dependent on a number of factors like humidity, atmospheric pressure, ambient temperatures, rains, wind speed and direction and more. Different instruments are used to measure each of these parameters. The meteorological department of each country collects this information to forecast the weather. Anemometer Anemometer is used to measure the direction of the wind,…
Depth of the sea is measured by two basic methods: by using the acoustic echo sounders on the ships and by using data from the satellite altimeters. As the name suggests, the echo sounders measures the depth of the sea by using echo of sound as measure. The instrument transmits a 10-30 kHz sound and…
Temperature is an indication of the measure of how hot or cold a particular substance is. Temperature is a physical property of a substance. It can be measured using a thermometer. A conventional thermometer contains mercury in a thin vial and is marked with a scale which helps a person read the temperature of a…