The two equivalent units of temperature that scientists commonly use are:

* Celsius (°C)

* Kelvin (K)

While Fahrenheit (°F) is used in some countries, it's not the preferred unit in scientific research.

Here's why Celsius and Kelvin are favored:

* Kelvin is an absolute temperature scale: It starts at absolute zero, the lowest possible temperature (-273.15 °C). This makes Kelvin ideal for calculations involving gas laws and other physical phenomena.

* Celsius is based on the freezing and boiling points of water: This makes it easier to relate to everyday experiences.

* Conversion between Celsius and Kelvin is simple: You simply add 273.15 to a Celsius temperature to get the equivalent Kelvin temperature.

Let me know if you'd like more information about temperature scales or conversions!