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A Specific Gravity Bottle (also known as a pycnometer) is a laboratory device used to determine the specific gravity (relative density) of liquids or solids (typically fine powders). Here are the standard specifications and features of a specific gravity bottle:
🔧 Specifications| Material | Borosilicate glass (commonly), or sometimes plastic (for industrial use) |
| Capacity | 25 mL, 50 mL, or 100 mL (most common is 50 mL) |
| Accuracy | High precision; tolerance ±0.01 g for mass measurements |
| Stopper Type | Glass stopper with a capillary hole to allow air escape when filled |
| Marking | Calibrated volume marking, typically at 27 °C or 20 °C |
| Shape | Round-bottom or flat-bottom |
| Neck Design | Narrow neck to minimize meniscus error |
| Weight | Typically measured empty and full to 0.01 g accuracy using analytical balance |