Liquid is one of the three major physical forms. It has no definite shape and is often affected by the container. But its volume is constant under pressure and temperature invariant. In addition, the pressure exerted by the liquid on the side of the container is different from that of other states. This pressure is sent in all directions, not decreasing and increasing with depth (the deeper the water, the greater the water pressure).
Features: no definite shape, fluid, and often affected by the container. The shape of the container, the liquid, the shape of the liquid. It has a certain volume, and the volume of the liquid is constant under pressure and temperature invariant. It's hard to compress into a smaller volume
The relationship with pressure temperature
The volume of the liquid is constant under pressure and temperature invariant. In addition, the liquid exerts pressure on the sides of the container as well as other physical states. This pressure is sent in all directions, not decreasing and increasing with depth (the deeper the water, the greater the water pressure).
An increase in temperature or reduced pressure can generally vaporize the liquid and become a gas, such as heating water to water vapor. Pressure or cooling can generally solidify a liquid and become a solid, such as reducing water to ice. However, pressure alone does not liquefy all gases, such as oxygen, hydrogen, and helium.
Liquid and solid, liquid and the isotropic characteristics (physical properties on different directions), that is because the objects from solid to liquid, due to the rise of temperature makes the atomic or molecular motion, and could no longer keep the original fixed position, so the flow is generated. But at this point the attraction between molecules or atoms is larger, so that they don't disperse, so the liquid still has a certain volume.
In fact, many small regions of the liquid interior still have the structure of a similar crystal - the "crystallographic region". Liquidity is the "class zone" that can be moved from one another to the other. We make a metaphor, on the asphalt off "traffic", each car has a fixed position is the man who is in a "zone", and the relative motion between the car and the car, this creates the flow of the whole team.
Liquid is different from gas, it has a certain volume. The liquid is different from the solid state. It is liquid and therefore has no fixed shape. In addition to liquid crystal, both liquid and amorphous solids are isotropic, which are the main macroscopic features of liquid.