General Science

Vitamin B12, is a water-soluble vitamin that has a key role in the normal functioning of the brain and nervous system, and the formation of red blood cells.

Light waves travel at 3x10⁸ m/s in a vacuum whereas sound requires a medium to travel through limits its speed ,usually 340 m/s in the air but considerably faster in water.

red which has the highest wavelength of all the colors, is used for danger signals is that red light is scattered the least by air molecules.So red light is able to travel the longest distance through fog, rain, and the alike.

Nichrome: Most heating elements use nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip.
Nichrome 80/20 is an ideal material, because it has relatively high resistance and has high melting point of about 1400 degree centigrade.
Also Nichrome has a very low resistivity in the range of 10–8 Ωm to 10–6 Ωm and are good conductors of electricity.

A solar cooker is a device which uses the energy of direct sunlight to heat, cook or pasteurise drink.

Inner wall of solar cooker is painted black because black colour is a good absorber of heat it absorbs heat and make the temperature hot inside the cooker.

Asthma : A condition in which a person's airways become inflamed, narrow and swell and produce extra mucus, which makes it difficult to breathe.
Asthma may cause difficulty breathing, chest pain, cough and wheezing. The symptoms may sometimes flare up.

Vitamin B2, or riboflavin, is one of eight B vitamins that are essential for human health. It can be found in grains, plants, and dairy products. It is crucial for breaking down food components, absorbing other nutrients, and maintaining tissues.

Among the list of fossil fuels, natural gas is considered to be the least polluting fuel, produce less carbon dioxide per joule delivered than either coal or oil.

Compressed Natural Gas (CNG) is a fuel which can be used in place of gasoline (petrol), Diesel . And is composed primarily of methane (91.9%) compressed at a pressure of 200 to 248 bars but may also contain ethane, propane and heavier hydrocarbons.
LPG is Liquefied Petroleum Gas, a mixture of propane and butane liquefied at 15 °C and a pressure of 1.7 - 7.5 bar.

The box type solar cooker consists of a rectangular box insulated on the bottom and sides & having two glass covers on the top. A single glass reflector whose inclination can be varied with the attachment to the box. Temperature up to 150 deg C can be reached in the cooker. But food containing water can be heated up to 100 deg C.

The human ear can respond to minute pressure variations in the air if they are in the audible frequency range, roughly 20 Hz - 20 kHz.

Plants make food in their leaves. The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis.

for Pasteurization of milk, the higher temperature 72° C (162° F) is required for 15 seconds , or alternatively the temperatures of about 63° C (145° F) is required for 30 minutes