Question 1

Is specific gravity the same as relative density?

Accepted Answer

Yes, they are often used interchangeably. Both are ratios to a reference substance.

Question 2

What is API gravity?

Accepted Answer

A petroleum industry scale where higher API means lighter oil. 10 API = water, >10 floats.

Question 3

What's the relationship between density and specific gravity?

Accepted Answer

Specific gravity is density relative to water (1 g/cm³). So a material with SG of 2.5 is 2.5 times denser than water, or 2500 kg/m³.

Question 4

Why does temperature affect density?

Accepted Answer

Most materials expand when heated, decreasing density. Water is unusual - it's densest at 4°C. This is why ice floats.

Specific Gravity to kg/m³ Converter

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