air safety ratings

Fuse Arrangement The fuse is a short piece of wire made of a material of high resistance and of low melting point so that it may easily melt due to overheating when excessive current passes through it. Generally an alloy of lead and tin is used as fuse wire. The fuse wire 'F' is stretched betwe..

We know that there is water vapour in air. In other words, air contains moisture and so it is wet. This quality of wetness is referred to as humidity. For our physical comfort, humidity should not be too high or too low. Usually when the atmospheric temperature is high, mo..

We know that there is water vapour in air. In other words, air contains moisture and so it is wet. This quality of wetness is referred to as humidity. For our physical comfort, humidity should not be too high or too low. Usually when the atmospheric temperature is high, more eva..

>The capacity of air to retain water vapour increases with increase in temperature. A rise in temperature causes the rate of evaporation to increase. Thus, many coastal areas have a higher percentage of humidity in summer than in winter. The mass of water vapour present in a lit..

The various categories of air pollutants and their harmful effects are summarised in the given table: Pollutant Source/Cause Effect Carbon monoxide Automobile exhaust, photochemical reactions in the atmosphere, biological oxidation by marine organisms, etc. Affects the respi..

A cannon ball was fired, which raised into the air at a constant rate of 30 ft/sec. Find the velocity and speed of the cannon ball. => 30 ft/sec, 30 ft/sec or 30 ft/sec, -30 ft/sec or -30 ft/sec, 30 ft/sec or None of the above..

The catalysts used in this process are platinum or vanadium pentoxide (V 2 O 5 ) that are heated to a high temperature. The optimum temperature required is 450 - 500 o C. Remember:- Low temperature favours the oxidation of sulphur dioxide. If the temperature is too low, the rate o..

Concentration of Reactants - In most cases, the rate of a reaction is accelerated with increase in concentration of a reactant. A piece of wood burns faster in oxygen than in air..

(i) Nitrogen is non-poisonous. But animals placed in an atmosphere of nitrogen die due to asphyxiation (lack of oxygen). (ii) Nitrogen dilutes the oxygen of the air and helps in regulating the rate of respiration and combustion. Breathing in pure oxygen enhances the rate..

Renewable Resources - The resources that can be replenished by the environment are called the renewable resources. These are also called the inexhaustible resources. These resources are constantly recycled in the environment like water. This also includes resources like the solar energy, air..