The following is an excerpt from Nisbet’s article on cream dispensers/whippers:
HOW TO USE A CREAM WHIPPER
Cream whippers are sealed canisters which use pressurized gas to aerate cream quickly. This saves time and effort when making milkshakes, whipped cream for fruits as well as a range of desserts and fresh pastries which makes these items perfect for commercial venues such as bakeries, cafes and kitchens.
Although this is their primary function they are also capable of a lot more than whipping up cream for dessert toppings and hot drinks. They can also be used to add texture to components of any savoury or sweet dish. They are perfect for making foams as well as hollandaise, infusions, sauces and mousses, not to mention flavoured cream for puddings, hot beverages and even cold cappuccinos.
They also allow delicate mixtures to be kept for longer in canisters, without exposure to the air. These reasons alone make the cream whipper a valuable and versatile tool for any kitchen.