# Check the numbers in a quote

Lesson 2 of [Evaluate a liquid cooling vendor before you buy](https://liquidcooling.fyi/academy/evaluate-a-liquid-cooling-vendor.md), 12 minutes.

A flow rate in a quote is a claim. You can check it with one equation. Heat moved = mass flow x specific heat x temperature rise. For water, use a specific heat of about 4.18 kJ per kg per K and a density of about 1 kg per litre. Worked examples - 50 kW with a 10 K rise needs about 72 litres per min…

The rest of this lesson is for learners enrolled in the course. [See how Evaluate a liquid cooling vendor before you buy works](https://liquidcooling.fyi/academy/evaluate-a-liquid-cooling-vendor.md).

Also on the [web page](https://liquidcooling.fyi/academy/evaluate-a-liquid-cooling-vendor/check-the-numbers-in-a-quote).