1. Group2 : liquid materials
Properties of liquid
1.Shifting shape
2.Weak molecular binding
3. It take pressure every sides
4. Turn to gas when heated
Used filed
Plant`s coolant.
hydraulic system
Lubricating oil
Rocket`s liquid fuel

2. Liquid material - Oil It is a liquid at room temperature.
Lighter than water : Spread a thin layer on the surface of the water made.
Viscous and combustible.
Do not dissolve in water
Oil is divided into animal, vegetable oils and mineral oils.
Mineral oils
industry, chief ingrediant is hydrocarbon and small amount of sulfur, oxygen and nitrogen
When the oil is separated by distillation gasoline, kerosene, diesel, fuel oil.
Used for Industrial raw gas and Heating fuel.
Animal, Vegetable oils
In general, there is a glyceric esters (glycerides) of various higher fatty acids.
Liquid at room temperature or have a solid nature, the former is usually oil, the latter is distinguished as fat.

3. Liquid material – Lubricating oil
It will have a suitable fluidity for the purpose.
It will have a meteor (油性) enough to withstand the lubrication between the two bodies.
High stability to oxidation and heat clean, homogeneous to one.
Fatty oil
As vegetable oils and animal oils are used in some applications, the raw material of mixed oil and grease for aircraft engines or cutting.
Mixed oil
Synthesized oil
Silicone oil : It is being used as a precision machine oil, hydraulic oil temperature and defoamers.
Di-Ester oil : It is used as a base oil of aviation equipment and jet engines, hydraulic oil and grease for low temperature for.