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Laboratory water bath — reference view
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Water reservoir

Holds the water that transfers heat to the sample vessel.

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Laboratory water bath — reference view

Image: Mnacke · Source / original · CC BY-SA 4.0

Resized and converted to WebP; original colours retained.

Laboratory water bath

Temperature & incubation

Laboratory water bath

Thermostatic bath · constant-temperature bath

THE FIRST VIVA QUESTION

What is its use?

Maintains samples at a controlled temperature for suitable biochemical reactions.

Tap a number to locate its part. Zoom, drag or use full screen to inspect the reference. Models and graduations can differ; check the actual apparatus used in your laboratory.

01 / IDENTIFICATION

How to recognise it.

  1. Insulated water reservoir
  2. Temperature setting or display
  3. Rack or lid depending on model
Tell the difference.

A water bath provides moderated heating; a hot plate heats a contact surface and may create larger temperature gradients.

02 / NUMBERED PARTS

Point them out.

Choose a part to bring its numbered marker into view.

03 / WORKING PRINCIPLE

The science behind the reading.

A heater and thermostat regulate the water temperature, and heat transfers to immersed sample vessels.

04 / VIVA PRACTICE

Think first. Then reveal.

Explain your answer aloud before opening it.

01Why is temperature important for enzymes?
SUGGESTED ANSWER

Reaction rate and enzyme stability depend on temperature; assays require controlled conditions.

02Does the displayed temperature prove the sample has equilibrated?
SUGGESTED ANSWER

No. The bath and sample may require time to reach equilibrium.

03Why monitor the water level?
SUGGESTED ANSWER

Too little water impairs temperature transfer and can damage some baths.

04Is it a steriliser?
SUGGESTED ANSWER

A routine laboratory water bath is not equivalent to a validated sterilisation process.

Read the references.

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