Common lab equipment
01 // Why it's worth learning the names
Lab instructions often name specific equipment rather than describing it — "transfer to an Erlenmeyer flask" assumes you already know what that looks like and why it was chosen over a beaker. Knowing the common pieces by name and purpose makes procedures far easier to follow on the first read.
02 // Quick reference
| Equipment | What it's for | Common mistake |
|---|---|---|
| Beaker | General mixing, heating, and rough-volume measuring | Using its printed volume markings for a precise measurement — they're only approximate |
| Erlenmeyer flask | Swirling and mixing without spilling, thanks to its narrow neck | Using it when a wide mouth is actually needed for adding solids |
| Graduated cylinder | Precise liquid volume measurement | Reading the top of the meniscus instead of the bottom |
| Test tube | Holding small samples, especially for heating or reactions | Pointing the open end toward yourself or a classmate while heating |
| Bunsen burner | An open flame for heating | Leaving loose hair or sleeves near the flame |
| Tongs / forceps | Picking up hot or small objects without touching them directly | Using bare fingers on something that was just heated |
| Funnel | Guiding liquid or filtering into a narrow opening | Pouring too fast, causing the liquid to overflow around the funnel's edge |
| Wash bottle | Rinsing equipment with a controlled stream of water | Overfilling a container because the stream is hard to stop precisely |
03 // General glassware safety
- Never use cracked or chipped glassware — a small flaw can fail suddenly under heat or pressure.
- Let heated glassware cool before handling it directly; hot glass looks identical to cool glass.
- Clean equipment before and after use so residue from a previous experiment doesn't contaminate the next one.
04 // Questions people ask
What's the difference between a beaker and an Erlenmeyer flask?
A beaker has straight sides and a wide open top, making it easy to add and remove things but easy to spill while swirling. An Erlenmeyer flask has a narrow neck and sloped sides, which makes it easier to swirl or heat contents without spilling, at the cost of being harder to add solids into.
Why shouldn't you point a test tube at yourself or someone else while heating it?
A liquid heated in a test tube can suddenly boil over or spit out of the open end, especially if it's heated unevenly. Pointing the open end away from everyone keeps a sudden eruption from causing a burn.
Can you use a beaker for a precise volume measurement?
Not reliably — the volume markings printed on a beaker are meant as a rough guide, not an accurate measurement. For precise volumes, use a graduated cylinder, which is manufactured specifically for measurement accuracy.