It's about 650,000 times as heavy as a Tennis Ball.
In other words, 895 firkins is 633,000 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.000001580 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00141 firkins. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about 800,000 times as heavy as a Golf Ball.
In other words, 895 firkins is 795,500 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.0000012570 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 0.001125 firkins. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about 1,000,000 times as heavy as a Light Bulb.
In other words, 895 firkins is 1,100,000 times the weight of a Light Bulb, and the weight of a Light Bulb is 0.000000910 times that amount.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.00083 firkins. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about 1,500,000 times as heavy as a Battery (AA).
In other words, the weight of a Battery (AA) is 0.000000670 times 895 firkins.(Alkaline)
An "AA" size battery weighs 0.00059 firkins. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about 1,500,000 times as heavy as a Mouse.
In other words, the weight of a Mouse is 0.000000590 times 895 firkins.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.00051 firkins. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about 2,500,000 times as heavy as a Compact disc.
It's about 3,000,000 times as heavy as a Battery (AAA).
In other words, the weight of a Battery (AAA) is 0.000000330 times 895 firkins.(Alkaline)
An "AAA" size battery weighs 0.00029 firkins. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.