Introduction:
Aluminium is a versatile metal that is widely used in various industries due to its unique properties. In this response, we will discuss the true statements about aluminium, which are all of the mentioned options.

Low Specific Gravity:
- Aluminium has a low specific gravity, which means it is lightweight compared to many other metals. Its specific gravity is about 2.7 g/cm3, which is approximately one-third of the specific gravity of steel.
- This low specific gravity makes aluminium an attractive choice in industries where weight reduction is desired, such as aerospace, automotive, and transportation.
- The low weight of aluminium helps in achieving fuel efficiency in automobiles and aircraft, reducing energy consumption and emissions.

Corrosion Resistance:
- Aluminium has excellent corrosion resistance due to the formation of a protective oxide layer on its surface.
- When exposed to air, aluminium reacts with oxygen to form a thin layer of aluminium oxide. This oxide layer acts as a barrier and protects the underlying metal from further oxidation.
- Unlike iron or steel, aluminium does not rust. This corrosion resistance makes aluminium suitable for applications in marine environments, construction, and outdoor structures.
- However, in certain aggressive environments, such as acidic or alkaline solutions, aluminium may require additional protective measures like coatings or anodization.

High Thermal Conductivity:
- Aluminium possesses high thermal conductivity, which means it can transfer heat efficiently.
- It has a thermal conductivity of about 237 W/m·K, which is approximately three times higher than that of steel.
- This property makes aluminium an ideal choice for heat exchangers, heat sinks, and other applications where efficient heat dissipation is required.
- The high thermal conductivity of aluminium also allows for faster and more uniform heating or cooling in applications like cookware and HVAC systems.

Conclusion:
In conclusion, all of the mentioned options are true for aluminium. It has a low specific gravity, corrosion resistance, and high thermal conductivity. These properties make aluminium a valuable material in various industries, contributing to its widespread usage.