The temperatures for a class I planet require a cool star or else a distant perihelion for the planet's orbit.

A high temperature and pressure is necessary, and sometimes requires the presence of a catalyst.

The most important external factors include temperature, water, oxygen and sometimes light or ts require different variables for successful seed germination.

The arctic temperature, which is the charm of a cold soup, requires that all seasoning be intensified, as the cold tends to mute it.

This temperature differential requires insulation, and isolation from the rest of the structure.

The thermal cycler heats and cools the reaction tubes to achieve the temperatures required at each step of the reaction (see below).

The high temperatures that can occur may require special system design to prevent overheating.

The engine's high operating speeds and temperatures required a new jet fuel, JP-7.

High temperatures require expensive alloys made from nickel or cobalt, rather than inexpensive steel.

A policy where publishers say they want temperatures to sink to a normal level and require that a certain amount of time be spent on the projects.