Application of the Principle of Expansion of Substances In Life

Application of the principle of expansion of substances in life very much, including the field of transportation, development and technology. The principle of expansion can be applied in everyday life. Application and utilization of expansion principle is used in construction technology, railway and railway, bimetallic, drying, and installation of glass.

Application of the Principle of Expansion of Substances In Life

The principle of expansion of many substances applied in everyday life. The following are some examples of their implementation.

Application of the principle of expansion of substances in the field of construction

Construction experts and architects of buildings, bridges, and roads must know the nature of expansion and shrinkage of solids caused by temperature changes. Highway during the dry season many are damaged and cracked, due to the expansion of steel and its asphalt. Bridges and highways are made of steel that are connected to each other. During the grafting process, the construction expert must really take into account the expansion and shrinking properties of iron due to temperature changes, both during hot and cold evenings.

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In order that the steel joints are not curved due to expansion or depreciation, the steel joints are not fixed, together with each other. There should be enough cavities between the joints to avoid damage to bridges and roads caused by the expansion and depreciation of the steel.

Application of the principle of expansion of substances in the field of transportation technology

When we pass through the railway track we will see the rail curved. As with bridges and highways, steel used for railroads should be installed in hollow gaps to prevent railroad accidents caused by curved rails due to expansion of daytime warming.

In addition to the railway, how to install railway wheel tires also use the principle of expansion. Before heated, the size of the tire diameter is slightly smaller than the diameter of the wheels. If the tire will be installed, it must be heated first in order to expand. Next, insert the tire into the wheel. Once inside, let the temperature drop. Once cool, the tire shrinks and will stick strongly to the wheel, without having to use a bolt.

Application of the Principle of Expansion of Substances in Bimetal Technology

Bimetal is a tool consisting of two different coefficient values of expansion or different expansion velocities, bonded together. For example, bimetal made of iron and copper before heated the bimetal is in a state of straight and then after heated, the bimetal will curve toward the metal (iron) which the coefficient of expansion length is small or slow expansion. Furthermore, if the bimetal is cooled it will be curved toward a metal (copper) whose coefficient value of expansion is large or expands rapidly.
Technological tools using bimetallic principles, including thermostats, automatic switches on irons, fire alarms, and thermometers.

Thermostat

Luxury hotel rooms located in cool or cold areas, such as in the Peak-Bogor, Lembang-Bandung, or other areas have heat settings of the room. The thermostat model can be seen in the picture. When the air in the room is cold, the bimetal plate will shrink, straighten, and touch the plain metal plates so that the two ends of the plate touch each other.

Read also : Basic Concept of Thermodynamics

The touch between the two metal ends makes contact with an electric current, an incoming electric current and a closed heater circuit that ignites the heater so the room warms. Conversely, when the room is warm enough, the bimetal plate will expand and return to its original position, ie bend, no contact with electric current, electric current cut off, so the circuit is open, heater is disconnected, and the heating of the room is finished.

Auto Switch in Automatic Iron

The temperature on the iron automatically, then it is called automatic iron. In the automatic iron there is a tool for automatically disconnecting and connecting electrical current, called an automatic switch. The working principle of automatic switch can be observed in the picture. When the temperature is high enough, the bimetal will curl away from contact (K), the electric current will break, the iron will cool down. When cold, the bimetal touches the contact (K), then the electric current flows back, so that the iron re-heat.

Fire Alert Tool

If there is an increase in temperature around the device, the bimetal touches the contact so that an electric current flows towards the electric bell. The electric bell will ring, indicating a fire or heat.

Bimetal thermometer

This thermometer is made of a curved bimetal. One end is clamped so it can not move. The other end is free to move and connected with a pointed needle. When the temperature rises, the bimetal becomes more curved. The pointer moves to the right. Conversely, when the temperature falls, the bimetal becomes more straight. The needle moves to the left.

How To Install Window Glass

Surely we have witnessed a carpenter when making window shutters or window frames. On the frame there is a gap that is made to place the glass. Glass is mounted on the part with the size of the glass is slightly smaller than the space or glass. This aims to maintain the safety of glass so as not to break, when experiencing expansion during the day or in the dry season.

Application of the Principle of Expansion of Substances In Life