**Fluid pressure** is exerted on the surface of an object in a liquid. This **pressure** causes **upthrust** . An object placed in a liquid will begin to sink. As it sinks, the liquid **pressure** on it increases and so the **upthrust **increases.

## Demo

In this tutorial you will learn how to calculate the **pressure** on an object in a fluid at a known **depth**.

The equation is written like this:

$P = { \text h \; \text x \; \text p \; \text x \; \text g}$

## Chilled practice question

Calculate the **pressure** 180 **m** below the surface of sea water. The **density **of sea water is 1025 **Kg/m ^{3}**. Use Gravity as 9.8

**N/kg**.

## Frozen practice question

Calculate the **density** of a liquid if the **pressure** exerted is 5880 **Pa** at a **depth** of 75 **cm**, take the **Gravitational field strength** of the Earth to be 9.8 **N/Kg**.

## Science in context

Fluid **pressure** is exerted on the surface of an object in a liquid. This **pressure** causes **upthrust**. An object placed in a liquid will begin to sink. As it sinks, the liquid **pressure **on it increases and so the **upthrust **increases.

## Millie’s Master Methods

#### Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s…

#### Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation…

## The Fridge Physics Store

#### Teacher Fast Feedback

Feedback to students in seconds – Voice to label thermal bluetooth technology…

#### Get Fridge Physics Merch

Why not buy a Fridge Physics baseball cap, woollen beanie, hoodie or polo shirt, all colours and sizes available. Free delivery to anywhere in the UK!…